various changes

.tmux.conf
* new keys for osx iterm2
* C-b sends command to nested tmux

vim
* updated peachpuff theme to stay the same with 256color, added
* set colorscheme to peachpuff2
* enable powerline
* ctags ignores .tox directory
* updated pathogen/syntastic settings

.zshrc
* virtualenvwrapper config added
* screen term now checked and set to 256color if necessary
* ack-grep alias ignores .tox directory
* new inova-login alias
peachpuff in the right place, mccabe to syntax checker