Virtualenv, NERDTreeCWD(), many small fixes

Changes:
- Quick foldlevel key shortcut
- Automatically open NERDTree when opening vimrc or dotfiles
- Turn off pymode-virtualenv, already too many things managing it
- Universal foldmethod re-applied
- always open on $PWD
- Virtualenv: look to WORKON_HOME for envs and inits
- Fixed NERDTreeToggleCWD()
  - NERDTreeFind => NERDTreeCWD: was doing stupid stuff to my windows
  - Fixed stuck-on-NERDTree window bug
- Added vimhelp ft quick keybind
- Added another markdown suffix
- git status puts cursor back to window. I check status more then I commit.