Added .zshrc

Added configuration file for zshrc. The contents of this file should be
appended to an existing zshell rc file. This loads aliases into the
zshell.
Modified UltiSnips configuration

On snippet results from YCM, pressing enter will expand the snipet. This
functionality was found https://github.com/SirVer/ultisnips/issues/376
(user kbenzie). Users should check for a better solution from UltiSnips
in the future.
Added useful packages to install

Setup and install_py_libs edited to add more useful packages and their
dependencies. Also, pip given more packages to install (instead of
package manager).
Deprecated bash in favor of zsh

Added automated setup for zsh and oh-my-zsh including an rc file that
is appended to an existing .zshrc file in the home directory.