feat(pods):Added Podspec - Standard to be in pod repos
feat(library): Token Flat Design Feature

TIToken's now support a 'flat design' that does not add a gradient
to the main body of the token. To use implement:
- (BOOL)tokenField: willAddToken:

And set your token's tint color and set flat design to YES.
feat(library): Added selected token color change for flat design

When a flat design token is selected / highlighted the color of the
selected state is made either slightly darker or slightly brighter.
This is determined based of whether or not the color is a 'dark' color
or if it is a 'light' color. A weighted distance of the RGB color space
is computed and if the color is greater than 127.5 it is darker.

Weighted RGB Brightness formula: brightness=sqrt( .241*R^2 + .691*G^2 + .068*B^2)

Added TIToken private methods:
- (UIColor *)lighterColorForColor:(UIColor *)c;
- (UIColor *)darkerColorForColor:(UIColor *)c;
- (BOOL)isColorDarker:(UIColor *)color;
feat(library): Added Keeping Track of currently highlighted token

Useful if you need to know when a token is being highlighted. For my use case
this was useful because of a 'tap to dismiss' checks to see if a token is being
highlighted and if it is then it won't dismiss the tokenfield from being the
first responder.
Merge remote-tracking branch 'VUID/master'

Conflicts:
	TITokenField.podspec