rm messages.json - broken maybe

adds messages.json and documentation for key bindings

Merge pull request #92 from 0xdevalias/0xdevalias/side-by-side-settings

update Main.sublime-menu to use edit_settings for side-by-side settings

prefer "view.show_popup" over "sublime.status_message" for errors and…

… alerts

Merge pull request #89 from maliayas/remove-html-popup

Don't use HTML popup for "No Difference" message

only support ST3

Merge pull request #77 from Starli0n/master

Platform specific configuration and Environment variable expansion

Merge pull request #70 from maliayas/diff-menu-improvement

Diff menu improvement

adds the 'reverse' option to all diff commands

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