Merge branch 'release/2.1.0' into develop
Updates of Xcode project 5.1 xcchemes
Fix minimum OS version to 10.6 in setup documentation
Update LastUgpradeCheck in HockeySDK project.

Schemes were updated in 85f2f66, but the same change in project.pbxproj
was forgotten.  Fix this and silence the upgrade warning.
Merge pull request #27 from vslavik/xcode5-upgrade

Update LastUgpradeCheck in HockeySDK project.
Merge branch 'master' of https://github.com/bitstadium/HockeySDK-Mac
Update with Xcode 6 recommended settings
Update with Xcode 6.1 recommended settings