added "tree" alias

https://github.com/mathiasbynens/dotfiles/commit/3459ae7f86cc8a2dad7440f012bb3a19c0585294
added "push --force" git alias

About time!
added paste board alias
removed "go home" function
removed "git typo" aliases

This reverts commit 50cfaf4230c21137c0cc14c3dff5b8345fc47327.
removed unused git aliases
made "browse github" git alias open current branch's issue
renamed ".coffee" global alias to ".co"
removed ".eco" global alias
removed redundant sound from "init" git alias