add `git branch` in mac command line

Reference: Creating a Happy Git Environment on OS X

touch ~/.bash_profile
# Git branch in prompt.
parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* (.*)/ (1)/'
}
export PS1="u@h W[33[32m]$(parse_git_branch)[33[00m] $ "

Pre-installed:

• XCode
• brew: use brew install node, java, mysql, jdk-8u25-macosx-x64.dmg, apache-maven-3.2.3-bin.tar.gz etc.

By the way, ~/.bash_profile and ~/.bashrc are all needed; `Advanced REST Client` and `postman` are good Chrome plugins, as well as Batarang.