Modify readme to add missing test/build step.
FIXED - Typo in Readme.md ; Environments.plist was missing the 's'
Merge pull request #15 from glesperance/patch-1

FIXED - Typo in Readme.md ; Environments.plist was missing the 's'
Merge pull request #14 from glesperance/model-collection-pointer

ADDED - Each model now has a `collection` property
Bump podfile version for AFNetworking