Explicitly include ATLog.h
Remove ATLog.h from PCH
Improve resourceBundle location for OSX and iOS.

NOTE: the "AT_RESOURCE_BUNDLE" preprocessor definition for locating resources in the bundle rather than target OS.
First pass at OSX apptentive Podspec.
Clean up `.podspec` to better match the iOS version.
Update to use the iOS repo's tag/version naming conventions.
Update to v0.4.10 for initial CocoaPods release.
Fixes IOS-574