vim: Add mappings to convert word to uppercase

Map <leader>U in insert and normal mode.
vim: Add mapping to reload current buffer

Map <leader>e! in insert and normal mode.
vim: Agressively reload the buffer on event FileChangedShell

Vim emits the event FileChangedShell when it notices the file has changed on
disk.
vim: Remove misplaced comment in vimrc
profile/less: Remove "-r" from LESS options

This option corrupts tab alignment in colored git-diff output.
git: Stop using tig as pager

Instead, use the user's default pager, usually 'less'. It's much faster than
tig.
git: Use default color.* options

In git-1.8.4, color.ui became the default.

Also, I fixed the bugs in my LESS environment configuration. So return
color.pager to its default too.
Merge branch 'master' of ssh://github.com/chadversary/home