add dependencies on AddressBook, CoreMotion and CoreLocation frameworks

bring GooglePlus dependencies from latest 1.1.0 cocoa pod.
Merge pull request #44 from DenHeadless/master

Latest cocoapod does not compile when using Objective-C modules
Merge pull request #47 from kkarayannis/master

Added Save To Camera Roll Activity.
Update README.

Added an explanation of pull request policy to the README. All significant changes and new features should be submitted to the dev branch only.
Update README.md

Remove cheesy stage play phrasing.
Fix bug in sample app project.
OSKEmailActivity & OSKSMSActivity can publish items with attachments, but no text.
Adds missing Google Plus activity import
Merge pull request #52 from inb4ohnoes/master

Adds missing Google Plus activity import
Merge pull request #51 from samingle/master

Allow email and SMS activities to publish when they have attachments but no text.
Merge upstream.