FIX: ignoere .extra file.

.extra file is individual setting file
Merge branch 'master' of github.com:YusukeKomatsu/dotfiles

* 'master' of github.com:YusukeKomatsu/dotfiles:
  ADD: git ailiases with comment.
  update Readme file
FIX: change brew tap.

delete phinze/cask
add caskroom/cask
ADD peco install command in Brewfile
FIX install commands in Caskfile
Include git-completion.bash if possible.
Merge branch 'master' of github.com:YusukeKomatsu/dotfiles

* 'master' of github.com:YusukeKomatsu/dotfiles:
  bootstrap.sh: Make `rsync` output numbers in a human-readable format
  Brewfile: Install Node with npm
  Brewfile: add instructions on how to change the default shell to Bash 4
  .bash_profile: Enable tab completion for `git` and `g`
  .bash_prompt: Speed up the Git commands for the prompt
  Brewfile: Install `hashpump`
  .gitconfig: Make sure `go` never overrides branches
  Caskfile: Move `phinze/cask` to `caskroom/cask`
  Brewfile: Fix PHP 5.5 installation
  .osx: Don’t show hidden files by default
  Brewfile: Install PHP 5.5 with GMP support
  Brewfile: Install `ucspi-tcp`, if only for `tcpserver`
  .osx: Don’t reset the desktop wallpaper when resetting Launchpad
  Brewfile: Install `xpdf`, if only for `pdfinfo`

Conflicts:
	.bash_profile
	Caskfile