Strip CR from parsed document

[sztosz]

PR for issue #107

Remove all carriage return characters from parsed document to matanin compatibility with editors working under Windows operating system. For Windows CRLF is default line ending, and simplest way to handle that is to simply remove all CR characters by using regex. If document has only LF line endings then convert_crlf_to_lf will simply return original document, because nothing is going to be replaced.

[doomspork]

Thank you @sztosz. @Rakoth any thoughts on this?

[Rakoth]

A test would be nice (example in slim-rb https://github.com/slim-template/slim/blob/94aa6274e51daa504e87ef193ca464548ced5004/test/core/test_encoding.rb#L4)

[sztosz]

I added test.

[Rakoth]

@doomspork lgtm

[doomspork]

Thank you @sztosz and @Rakoth 👍