Fixes diff issues on Linux

• fixed broken sed command on Linux (#9)
• fixed pager showing control characters on Linux
• improved auto-update using git to detect the current repo status

Minor bugfixes

• fixes issues with rsync filters resulting in path= option not working (see http://stackoverflow.com/questions/505289/using-rsync-to-delete-a-single-file) (#7)

Improved diff and no more dependencies

This release brings many improvements to the diff command in frak. Features include:

• colorized diff output (no by default, can be turned off with --no-color)
• pagination for diff output
• improved diff performance for large changesets by comparing files over a single SSH session
• improved unified diff format to look more like git-diff
• bonus: removed Highline gem dependency

Add support for backups and auto-updating

This release adds the following features:

• Backups performed by rsync with included patch file
• Auto-update functionality

And fixes the following bugs:

• Unable to override configuration parameters via the command line

Added support for --rsync-path option.

This is a small feature enhancement which allows you to specify the --rsync-path option so you can do things with sudo rights on the receiving end.