`linuxonly` doesn't work unless renamed properly

Unlike all other files listed in the themes directory, this file is the only
one that's "doing it's own thing"
agnoster theme not showing virtualenv status

agnoster theme was checking if the default virtualenv prompt was turned off and not showing its own... so there was no way to see which virtualenv was selected.
bundle plugin throwing error when bundle is not in path while initializing
python3 clean updated.
Merge pull request #2245 from cadusk/p3

python3 clean updated.
Merge pull request #2243 from sabarishcrri/bundle_plugin_nobundle_fix

bundle plugin throwing error when bundle is not in path while initializing
Merge pull request #2239 from santagada/master

agnoster theme not showing virtualenv status
Merge pull request #2218 from wari/linuxonly-rename

`linuxonly` doesn't work unless renamed properly
Merge remote-tracking branch 'origin/master' into Darwin