Added /etc/hosts submodule
Added a git-rewrite-history script
Added a github-pull-request script
Minor changes to screenrc
Removed Python-specific sublime-text-2 settings (I'm not sure what
impact this will have)
Tidied up shell aliases
Tidied up shell functions
Minor tidying
Removed superfluous whitespace
Removed pager argument from ackrc as I don't believe that it is needed
Minor fixes
Added -readable test in source function
Piped stderr to /dev/null to suppress errors in source function
Added environment stuff
Added some OS functions
Cleaning up of some shell dotfiles