Merge pull request #22 from r-e-d/master

Improve tokenizer ('^=', '|=', '<<=', '>>=', ...).
Separate out coverage viewing
Get rid of cache

It doesn't work properly (at least part of the time). And it is actually
makings things slower.
Handle keyboard interrupt at top level
Catch only exception that is needed
Add more test coverage
Make "_verify_includes()" actually work
Use better include path order
Improve test coverage
Remove redundant warnings
Remove unused parameter
Just show all the warnings
Handle ref-qualifiers.

Fix parsing for this king of code:
class Optional {
  void getValue() & { }
  void getValue() && { }
};