Adds virtualenv and pytest plugins to vim
Chaged javascript plugin
Adds ultisnips plugin for snippets and the snippets collections repo
Fixed wildignore settings:

- Fixed syntax
- Added some folders and files
- Removed .git and .svn to prevent conflicts with other plugins e.g.
  fugitive
Fixed mappings for ctags commands
Adds new options for plugins:

- ctrlp: enables tag extension and ignores git and svn folders
- tagbar: enables some useful functions and coffeescript support
- ultisnips: sets ultisnips mappings
Improves formatting in vimrc file

- Remvoes unused command-t options
Adds virtualenv support in zshrc file