Adding screenshots and updating readme to link to themes
Replace wiki link wtih repo link to avoid maintenance
Adding black and white screenshots, bigger font
Compressing files
Converting all files to png
Adding new better compressed terminal screenshots
Update chruby prompt to show "(system)" when using system ruby
Merge pull request #263 from aramprice/master

Update chruby prompt to show "(system)" when using system ruby
removing backup folder
Merge pull request #260 from HaloZero/feature/theme-screenshots

Feature/theme screenshots
Merge remote-tracking branch 'upstream/master'

Signed-off-by: Mariusz Fik <fisiu@opensuse.org>