Ignore the Roslyn IDE cache
Update to the latest release of ANTLR 4
Merge branch 'sharpen'
Merge pull request #51 from sharwell/roslyn-cache

Ignore the Roslyn IDE cache
Fix build errors in newly generated code
Merge remote-tracking branch 'sharwell/master'
Move Checksum and CRC32 classes to testing library since they aren't used in the runtime (fixes #48)
Mark Sharpen classes internal where possible
Fix errors in documentation comments
Remove dead code statements
Merge pull request #52 from sharwell/fix-48

Fix 48
Fix errors in documentation comments
Specify StringComparison in call to Equals
Merge pull request #53 from sharwell/cleanup

Cleanup
Rename projects, assemblies, and preprocessor directives to more closely match NuGet packaging
Use the client profile for the .NET 3.5 and .NET 4.0 builds
Rename Sharpen namespace to Antlr4.Runtime.Sharpen to avoid naming conflicts
Merge pull request #54 from sharwell/sharpen-namespace

Rename Sharpen namespace to Antlr4.Runtime.Sharpen to avoid conflicts
Merge pull request #55 from sharwell/client-profile

Client profile
Extend PCL support to Silverlight 5 and Windows Phone 8