Remove Drush submodule in favour of installing via homebrew

brew install --HEAD drush
.gitignore: Remove search_krumo

This has been included in _dev_modules for a while now.
.gitconfig: Use .gitconfig.local instead of .extras

For storing git credentials and other local overrides.
Remove custom .gitattributes

Not being used currently.
Remove unneeded/unused symlinks from bin: bash and difffork
Fresh-ify dotfiles. Removes bootstrap.sh and drushup.sh.

To use Fresh:
a) Move your dotfiles repo to ~/.dotfiles, git pull and run:
bash -c "`curl -sL get.freshshell.com`" && source ~/.bash_profile
Update README for fresh and other changes.

The diffstat is pretty nice here.
Symlink Sublime Text 2 or 3 conditionally via freshrc
Remove unused .gvimrc and .hgignore
Rename files to get rid of dot prefixes
Rename .vim to vim and copy with fresh
Only source .path and .extra through .bash_profile

Compile the rest with fresh.
Remove ~/bin from bash_profile PATH

fresh's shell.sh adds ~/bin to the path anyway.