Added help. General clean-up of the entire code

* Instead of creating multiple maps for each foldlevel, a map is now created to call a function which accepts the
  foldlevel to operate on from the user thereby reducing the number of maps by ten-fold!!!
* Parses &commentstring to insert foldmarkers therey removing dependency from NERDcommenter
* Customizable shortcuts to open/close/align foldmarkers
* Added function to remove foldmarker from the current line