Merge branch 'hotfix/2.1.0'

* hotfix/2.1.0:
  Add update instructions
  Change nuspec dependency versions
  updated documentation
  Remove RC tag, now at 2.1
  BuildSystem update
  Update dependencies
  Limit Iesi.Collections to versions < 4
  Fix for Nuget 2.1 packages
  Renamed Raven UnitOfWork to Transaction
  Documentation update
  Remove Iesi.Collections from web project
  update Raven nuspec to use raven 2.0 - 3.0
  Minor contributions.md changes
  Add build commands to contributing.md
  Add CONTRIBUTING document
  Updated dependences Raven2.0
  Bump to 2.1RC3
Reintroduced nuget package icons
Up to version 2.1.1
Submodule update
Merge branch 'hotfix/2.1.1' into develop

* hotfix/2.1.1:
  Submodule update
  Up to version 2.1.1
  Reintroduced nuget package icons

Conflicts:
	Build/Build.proj