Use rcm for dotfile management

[omares]

rcm is "a management suite for dotfiles" making the setup and update of all dotfiles a breeze.

As dev-setup depends on a few dotfiles, rcm is a perfect fit. It bolsters the setup process and on-top makes it easier for users to sparkle in their own .dotfiles by the power of rcm :)

So what does this PR do?

• Move everything dev-setup related to the .dotfiles directory under the "dev-setup" tag
• Remove the need to manually copy a few files as rcm takes care of that, including the .python profile and themes
• Add a rcm.sh that installs rcm via brew and runs the appropriate command
• Most files are symlinked making it less destructive as the current boostraping

Whats the downside?

• boostraping requires homebrew to grab rcm

@donnemartin What do you think?

[omares]

Thinking about it, i could take the rcm implemention a step further and move most of the shell scripts into the dev-setup tag. This would allow users to customize their setup by duplicating what they need into their own tag and using rcm to give their version precedence.

This wouls remove the need to modify the original files.

[omares]

Closing in favour of #83