Implement Crystal lexer (based on RubyLexer)

Update Lasso lexer with fixes for edge cases and reordered builtins list

Update the dates, and remove the copyright assertion, which doesn't make
sense for a file in the public domain.

Teach autopygmentize about application/javascript.

Update the list of MIME types that can't be mapped relative to file 5.20 and
pygments 2.0.

Fix a FIXME that needed a 2.0 feature. In the process, remove some
hard-wired settings (-f terminal256 -O style=native) that were not commented
on in the commit that introduced them (changeset 2846).

updating & sorting Lasso builtins file

Conflicts:
	external/autopygmentize