mainContext property renamed
Merge pull request #23 from Sitecore/sdk2.0_addRenaming

[renaming] property renamed  :  mainContext  ---> mainSession
apple doc fix
apple doc fix
[split] Removed obsolete "sample app" project
Merge remote-tracking branch 'origin/sdk2.0' into sdk2.0-appledoc

1. Renamed : mainContext ----> mainSession
2. Added reference documentation for SCMapView