Continued house cleaning.

- Moved all autocmd to logical groups.
- Groups number related settings.
- Moved tag related bundles to be conditionally installed based on
  whether ctags is available.
- Added conditionals for setting clipboard based on OS type.
- Commented out/removed plugins/settings that aren't being used.
- Added paste toggling to handle those pesky indent issues from
  copy/pasting from GUI to CLI.
- Added spell check setting.
- Fix conflict of keymappings between NERDTreeFind and visual mode
  yank/copy to pbcopy.
- Added NeoCacheCompl settings.