Create a default tmux session only when none defined in tmux.conf

Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
Support $PYTHONUSERBASE per PEP 370

Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
Custom Sorin theme
Custom Steeef theme
Custom git alias
Custom rails alias
Custom ruby alias
Custom zprezto resource defenitions
Custom editor and path list
Export JAVA_HOME