Bump to 2.1RC3
Updated dependences Raven2.0

Raven internalised Json.Net, fixing dependency problems we were having.
Add CONTRIBUTING document
Add build commands to contributing.md
Minor contributions.md changes
update Raven nuspec to use raven 2.0 - 3.0
Remove Iesi.Collections from web project
Merge branch 'hotfix/RC3'

* hotfix/RC3:
  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