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>
Disable login/logout messages
Enable syntax highlighting
Enable Ruby support
Enable git support
Fix for using a carrot in commands ("git reset HEAD^^")
Set Sublime Text as the default editor.
Misc aliases
Disable Ruby aliases
Disable git aliases
Added nodenv support
Enabled node support
Load id_rsa into the ssh agent
Added ~/bin to path
Ignore .DS_STORE
Added custom prompt theme
Use atom as the default editor