Fixed keybinding conflict introduced as part of #526.
Merge pull request #551 from dsimmons/fix/nerdtree-keybinding

[Fix] Keybinding conflict introduced as part of #526.
Point vim-multiple-cursors to current owner
Merge pull request #556 from stevenbarragan/update-multicursor-plugin

Point vim-multiple-cursors to current owner
Change source repository
Add tmux aliases and disable screen-like bindings
Alias adjustments for OS X