Add switches
OMG! I've noticed `set nocompatible` modifies some option values!
<Leader> setting must precede NeoBundle settings for plugin mappings
Use stronger encryption method
Install vim-over and use cmdwin by default

http://d.hatena.ne.jp/osyo-manga/20131105/1383664737
Revert "Install vim-over and use cmdwin by default"

This reverts commit 69cf33f59e8a69f699180960793122daf63b72b7.
Problems:
  * c flag of :substitute
  * AlterCommands
  * Completion
Install vim-sneak