.osx: Don’t show hidden files by default

Most of the time I don’t need it, and when I do, I can temporarily enable it using the `show` alias, and revert it using the `hide` alias.
Brewfile: Fix PHP 5.5 installation

Thanks to @interputed for the heads up: https://github.com/mathiasbynens/dotfiles/commit/a76db30d6529e41138009fe3dc67f21ba782496e#commitcomment-6200104
Caskfile: Move `phinze/cask` to `caskroom/cask`

Homebrew Cask has been moved to https://github.com/caskroom/homebrew-cask.

Closes #375.
.gitconfig: Make sure `go` never overrides branches

Closes #357. Thanks to @yukideluxe!
Brewfile: Install `hashpump`
.bash_prompt: Speed up the Git commands for the prompt

Fixes #227 and closes #380.
.bash_profile: Enable tab completion for `git` and `g`

Closes #197.
Brewfile: add instructions on how to change the default shell to Bash 4
Brewfile: Install Node with npm

Ref. https://github.com/Homebrew/homebrew/pull/28075. Closes #362.
bootstrap.sh: Make `rsync` output numbers in a human-readable format

Closes #383.
make custom changes in .osx, .vimrc
add vim plugin: fencview
add goagent start script
add formula in brew
add .extra and .path files