Merge branch 'release/0.3.0' into develop
Initial commit of gray colorscheme.
vim powerline theme associated with gray powerline colorscheme.

Contains minimal information. No branches, simplified mode indicator,
file format, file encoding, etc.
Updated vim configuration to use gray colorscheme and theme.
Removed all non vim configurations from powerline folder.

Removed ipython, shell, tmux, wm. These configuration files are not
associated with vim and therefore should not be included in a vim
configuration repository.
Changed screenshot to reflect gray vim powerline colorscheme.
Moved powerline read only indicator to after file name.
Changed powerline file change indicator from '++' to '+++'
Updated screenshot to reflect powerline modified indicator change.
Fixed annoying ir_black colour issues.

The following changes were made

- WildMenu now uses a blue highlight on a black background.
- Popup Menu now uses dark grey background with blue highlighting.
- Error messages are in red text.
- Search results are white text on a red background.
- Spelling checks are white text on an orange background.
- TODO, FIXME, NOTE, etc are now white text with purple background.
- Exception statements (try, catch, finally) are in yellow text.
- GUI bold statements removed.
Made README note that this vimrc degrades without python.
README updated with more detail on powerline config install.
Updated release notes for 0.4.0: New colours! Powerline and colorscheme.
Releasing 0.4.0: New slim gray powerline colour scheme, and updated ir_black.