Vim: use mapping commands more consistently
Vim: use mapping commands more consistently

  - stuff which should only be used in normal mode should only be mapped
    in normal mode
  - stuff which can be <silent> (ie. stuff which has a side-effect which
    already provides feedback that an action took place) should be
    <silent>
  - don't recursively expand maps (eg use noremap basically everywhere)

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

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