Update README.md
Fixed nuspec file
added silverlight 5 support
added silverlight to nuspec,bumped version to 1.2
changed NotifyOfPropertyChanged signatures

added CallerMemberName support
added overload that takes a memberexpression instead of the propertyname
Merge pull request #5 from wagich/master

Added Silverlight 5 support and harmonized NotifyOfPropertyChanged()
Bumped version to 1.2.0, updated .gitignore to ignore nupkg files, updated README.md
Created ChangeLog.md
Upgraded to Caliburn.Micro v1.5.2 (including internal changes to rewritten classes)
Added changes to ReactivePropertyChangedBase proposed in issue #7