Fix URLs in tmux documentation

Use full URLs instead of relative urls.

Fix link about kernel issues with tmux on Mac OS X.
[Fix #257] Add zstyles from READMEs to zpreztorc
Add a missing backslash
Fix the setting of $manpath in haskell
[Fix #289] Describe all modules in a README
[Fix #290] Add fish shell style PWD to sorin theme
Refactor terminal
Use Git porcelain commands in git-hub
Add support for browsing GitHub tags
Rename git-hub to git-hub-browse
Rename git-hub-short-url to git-hub-shorten-url
Add Git submodule moving and removing
Add an alias for stashing the Git working copy
Add git-grep aliases
Add a missing '.'
[Fix #299] Set EXTENDED_GLOB in set-titles-with-path
Do not setopt LOCAL_OPTIONS in set-titles-with-command

emulate -L zsh sets LOCAL_OPTIONS and LOCAL_TRAPS
[#297] Check for RVM and rbenv before returning
[Fix #297] Check for pythonz before returning
[Fix #293] Add CONTRIBUTING.md