regexp: use MAX_REPEAT from rpython (could fix current test failures)
adjust flake rules + fix E713 in lexer

"E129 visually indented line with same indent as next logical line" should
not be check as inside the project visually and next logical line are
separated via a empty line.

Exclude docs directory as docs/conf.py violates "E265 block comment should
start with '# '"
Mark tests that crashes the rubyspec execution

Mark all specs that are segfaulting topaz or can not be executed due
to missing language implementations.
Tagging new but not implemented specs
Tag remaining specs (e.g. travis specific issue)
fixtures/file_types.rb is used on one addtional spec

Disables also "core/file/stat/ftype_spec.rb" as it results in a runtime error
on travis.
Merge pull request #830 from mswart/test_failures

Fixing / Tagging the current build errors