Powerline-shell

* New options and symbol for the `battery` segment
([kc9jud](https://github.com/b-ryan/powerline-shell/pull/332))
* Update `svn` segment to use threads
([kc9jud](https://github.com/b-ryan/powerline-shell/pull/333))
* Fix `username` segment in cygwin
([ericLemanissier](https://github.com/b-ryan/powerline-shell/commits/master))

* New option for `cwd` segment that allows the last directory to not be
shortened when `max_dir_size` is used
([jceaser](https://github.com/banga/powerline-shell/pull/321)).

* VCS segments will use ASCII `?` instead of a unicode symbol for new files.

* Fix cwd bug when `$HOME` ends in a slash
([tbodt](https://github.com/banga/powerline-shell/pull/309))
* Use docker to run tests
([aa8y](https://github.com/banga/powerline-shell/pull/297))

* tcsh support

* Fix username segment's background color after "su" command
([Fak3](https://github.com/banga/powerline-shell/pull/175))
* New `battery` segment which shows the percentage your battery is charged and
an icon when your battery is charging.
([wattengard](https://github.com/banga/powerline-shell/pull/204))
* New `aws_profile` segment which shows which AWS profile you are using.
([bryangrimes](https://github.com/banga/powerline-shell/pull/223))