change path to local config.fish and remove old path from gitignore
add new way to extend tmux
Merge pull request #24 from SnJedi/feature/extendable-fish

Extendable config.fish
Merge pull request #25 from SnJedi/feature/extendable-tmux

Extendable Tmux
Delete dropbox.sh
Delete adium.sh
Delete brew_cask.sh