change "gulp build" as a postinstall script of npm.
support to use postgresql as backend storage.
add pastry.commons as a regular app.
set up browser-sync instead of livereload.
add plumber to prevent the flow errors.
implement a basic layout of home.
upgrade to python 3.4.2 and migrate to pyenv-up
update the README for development bootstrap.
Merge pull request #6 from tonyseek/feature/f2e-bootstrap

Configure BrowserSync and so on.