Updated Polish language file - thx admas :)
Merge branch 'master' of https://github.com/SubtitleEdit/subtitleedit
Fixed top alignment in D-Cinema - thx Robbie :)
Update pl-PL.xml
Move Changelog.txt in root dir.

It makes more sense to have it there so that's easier to see.
Simplify .gitignore.
Updated Portuguese language file - thx moob :)
Updated Greek langauge file - thx akis :)