Delete trailing whitespace
- #EngineeringDay
- Total replaced: 506  Matching files: 118

Did not change any files under test/Microsoft.AspNet.Razor.Test/TestFiles
- avoiding need to redo hashes
Apply VS' FormatDocument and RemoveAndSort to all *.cs files
- #EngineeringDay

Did not change any files under test/Microsoft.AspNet.Razor.Test/TestFiles
- avoiding need to redo hashes
Add xml-docs-test target to end of default build
- #EngineeringDay
- correct a couple of XML doc issues in the repo
Add missing license headers
- #EngineeringDay
- skip generated files such as Resources.Designer.cs and files under
  test\Microsoft.AspNet.Razor.Test\TestFiles\CodeGenerator\CS\Output
Modify TagHelperDescriptorResolver and dependencies to not throw.

- Changed the TagHelperDescriptorResolver, TagHelperTypeResolver and AddOrRemoveTagHelperSpanVisitor to not throw when they're unable to understand the users directive lookup text.
- This involved utilizing the new ParserErrorSink to capture errors found during TagHelperDescriptor resolution.

#210
Add and modify tests to validate TagHelperDescriptorResolver doesn't throw.

- Modified existing tests that expected the resolvers to throw to no longer throw.
- Added new test to validate that unexpected errors that are thrown are also handled.

#210
Addressed code review comments.
Addressed code review comments.

- Also removed a throwing case in the CSsharpCodeRenderer. This case will be fixed and a custom error for the issue currently would be a large amount of work. For now we'll cause a compile error.