Fix EasyNetQ.nuspec by adding the dependency on System.Collections.Immutable.Net40
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Source/Version.cs
Use ILRepack to internally merge  System.Collections.Immutable.Net40
Internalize ReadOnlyCollectionsInterfaces.dll as well, since it is a dependency of System.Collections.Immutable.Net40.dll
The internalization of ReadOnlyCollectionsInterfaces.dll apparently gives problems when used on a .net4.5 platform, so revert to dependencies.
Correct version text in Version.cs
Merge pull request #285 from noxhoej/master

Fix EasyNetQ.nuspec by adding the dependency on System.Collections.Immut...