Working auth and photo json endpoint

Signed-off-by: Kris Nóva <kris@nivenly.com>

vendor/github.com/shopspring/decimal/README.md

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+# decimal
+
+[![Build Status](https://travis-ci.org/shopspring/decimal.png?branch=master)](https://travis-ci.org/shopspring/decimal) [![GoDoc](https://godoc.org/github.com/shopspring/decimal?status.svg)](https://godoc.org/github.com/shopspring/decimal) [![Go Report Card](https://goreportcard.com/badge/github.com/shopspring/decimal)](https://goreportcard.com/report/github.com/shopspring/decimal)
+
+Arbitrary-precision fixed-point decimal numbers in go.
+
+_Note:_ Decimal library can "only" represent numbers with a maximum of 2^31 digits after the decimal point.
+
+## Features
+
+ * The zero-value is 0, and is safe to use without initialization
+ * Addition, subtraction, multiplication with no loss of precision
+ * Division with specified precision
+ * Database/sql serialization/deserialization
+ * JSON and XML serialization/deserialization
+
+## Install
+
+Run `go get github.com/shopspring/decimal`
+
+## Requirements 
+
+Decimal library requires Go version `>=1.7`
+
+## Usage
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/shopspring/decimal"
+)
+
+func main() {
+	price, err := decimal.NewFromString("136.02")
+	if err != nil {
+		panic(err)
+	}
+
+	quantity := decimal.NewFromInt(3)
+
+	fee, _ := decimal.NewFromString(".035")
+	taxRate, _ := decimal.NewFromString(".08875")
+
+	subtotal := price.Mul(quantity)
+
+	preTax := subtotal.Mul(fee.Add(decimal.NewFromFloat(1)))
+
+	total := preTax.Mul(taxRate.Add(decimal.NewFromFloat(1)))
+
+	fmt.Println("Subtotal:", subtotal)                      // Subtotal: 408.06
+	fmt.Println("Pre-tax:", preTax)                         // Pre-tax: 422.3421
+	fmt.Println("Taxes:", total.Sub(preTax))                // Taxes: 37.482861375
+	fmt.Println("Total:", total)                            // Total: 459.824961375
+	fmt.Println("Tax rate:", total.Sub(preTax).Div(preTax)) // Tax rate: 0.08875
+}
+```
+
+## Documentation
+
+http://godoc.org/github.com/shopspring/decimal
+
+## Production Usage
+
+* [Spring](https://shopspring.com/), since August 14, 2014.
+* If you are using this in production, please let us know!
+
+## FAQ
+
+#### Why don't you just use float64?
+
+Because float64 (or any binary floating point type, actually) can't represent
+numbers such as `0.1` exactly.
+
+Consider this code: http://play.golang.org/p/TQBd4yJe6B You might expect that
+it prints out `10`, but it actually prints `9.999999999999831`. Over time,
+these small errors can really add up!
+
+#### Why don't you just use big.Rat?
+
+big.Rat is fine for representing rational numbers, but Decimal is better for
+representing money. Why? Here's a (contrived) example:
+
+Let's say you use big.Rat, and you have two numbers, x and y, both
+representing 1/3, and you have `z = 1 - x - y = 1/3`. If you print each one
+out, the string output has to stop somewhere (let's say it stops at 3 decimal
+digits, for simplicity), so you'll get 0.333, 0.333, and 0.333. But where did
+the other 0.001 go?
+
+Here's the above example as code: http://play.golang.org/p/lCZZs0w9KE
+
+With Decimal, the strings being printed out represent the number exactly. So,
+if you have `x = y = 1/3` (with precision 3), they will actually be equal to
+0.333, and when you do `z = 1 - x - y`, `z` will be equal to .334. No money is
+unaccounted for!
+
+You still have to be careful. If you want to split a number `N` 3 ways, you
+can't just send `N/3` to three different people. You have to pick one to send
+`N - (2/3*N)` to. That person will receive the fraction of a penny remainder.
+
+But, it is much easier to be careful with Decimal than with big.Rat.
+
+#### Why isn't the API similar to big.Int's?
+
+big.Int's API is built to reduce the number of memory allocations for maximal
+performance. This makes sense for its use-case, but the trade-off is that the
+API is awkward and easy to misuse.
+
+For example, to add two big.Ints, you do: `z := new(big.Int).Add(x, y)`. A
+developer unfamiliar with this API might try to do `z := a.Add(a, b)`. This
+modifies `a` and sets `z` as an alias for `a`, which they might not expect. It
+also modifies any other aliases to `a`.
+
+Here's an example of the subtle bugs you can introduce with big.Int's API:
+https://play.golang.org/p/x2R_78pa8r
+
+In contrast, it's difficult to make such mistakes with decimal. Decimals
+behave like other go numbers types: even though `a = b` will not deep copy
+`b` into `a`, it is impossible to modify a Decimal, since all Decimal methods
+return new Decimals and do not modify the originals. The downside is that
+this causes extra allocations, so Decimal is less performant.  My assumption
+is that if you're using Decimals, you probably care more about correctness
+than performance.
+
+## License
+
+The MIT License (MIT)
+
+This is a heavily modified fork of [fpd.Decimal](https://github.com/oguzbilgic/fpd), which was also released under the MIT License.