ignoring .bundle
Fix to compile
Fixes  to the pcl-csproj file
First set of compiler fixes

- Removal of Serializable directives and unused namespaces
- Use of generic collections and LINQ
- Some fixes in Typeextensions
Second set of fixes, excluding AssemblyScanner

ApplicationException -> Fitting Exception
ForEach -> Each
and a few more
Fix of AssemblyScanner+Net4 project
- File-related scanning ops are in extension methods from a lib that is purely for .NET4
merged @flq's PCL branch
tweaking up the rake script, assembly info, and tests after the big PCL merge
cleaning up some obsolete stuff, tweaked up the nuspec packages, fixed assembly scanning problems from the PCL split