[Homebrew] add Brewfile for brew bundle.
[tmux] add color settings.
[tmux] add mouse settings.
[tmux] add terminal and clipboard settings.
[tmux] add Japanese settings.
[tmux] improve escape-time.
[vim] add neosnippet-snippets.
[vim] change heading for folding.
[vim] add vimdiff and git merge tool settings.
[vim] refine ruby settings.
[vim] fix neocomplete settings for Japanese input-method.
[vim] add ruby omnifunc for neocomplete.