Added powerline user config files.

These are installed in the ~/.config directory. These are only
the defaults. The colours and setup of the powerline can be changed by
altering the colorschemes/default.json or themes/vim/default.json.
Moved comment about removing ^M (<leader>m) to above command.

Previously the comment was inline with the command.
Add commands on installing powerline config files to README.

Changes made to both the standalone commands and the Dropbox commands.
Consolidated ln commands for Dropbox config in README.

Ideally this should work outside of zsh, since {} globbing is used.
Updated RELEASE.md to reflect changes made in 0.0.2
Merge branch 'release/0.0.2'