updated git ignore
Merge branch 'release/20130612'

Conflicts:
	.gitignore
Merge branch 'develop'
Merge branch 'release/20130620'
update Glass.Mapper.Sc version dependency
Merge branch 'release/20130824'
start of unit tests for render image
unit tests for RenderImage
tests and changes for RenderLink
Merge branch 'hotfix/issue21' into develop
Item null check in Utilities.GetField