Fixed MemoryCacheClient to incr/dec by supplied value

Fixed MemoryCacheClient to incr/dec by supplied value rather than 1/-1
Mismatched version of DotNetAuth causing xbuild errors
Merge remote-tracking branch 'upstream/master'
MemoryCacheClient decrement by amount * -1
Merge pull request #761 from DveMac/master

Fixed MemoryCacheClient to incr/dec by supplied value & Mismatched version of DotNetAuth causing xbuild errors
fix references
Merge branch 'master' of https://github.com/ServiceStack/ServiceStack
fix proj refs
Fix #754: Ensure GetSession(true) will remove existing session from Request.Items before adding the newly generated one.
Always use \r\n as newLine while composing the mime-encoded body of PostFileWithRequest(..) as mandated by rfc1521.
Merge pull request #766 from pruiz/fix-747

Always use \r\n as newLine while composing the mime-encoded body of PostFileWithRequest(..) as mandated by rfc1521.
Add DotNetOpenAuth NuGet package
Also check Items when checking from Cookies. fixes #762
Merge pull request #765 from pruiz/fix-754

Fix #754: Ensure GetSession(true) will remove existing session from Request.Items before adding the newly generated one.
Move ApiAllowableValuesAttribute to ServiceStack.Interfaces
Merge branch 'master' of https://github.com/ServiceStack/ServiceStack