.aliases: Add `jsc` alias

Useful for testing code in JavaScriptCore.

Hat tip: https://twitter.com/RussB/status/420409644117262336 (via @rauschma)
.functions: Make `np` remove `node_modules`

This lets you catch cases where you forgot to add a dependency to `package.json`.

Closes #321.
.osx: Support multiple `systemuiserver` pref files

Closes #319.
Merge branch 'master' of https://github.com/mathiasbynens/dotfiles

# By Manpreet Singh (1) and others
# Via Mathias Bynens
* 'master' of https://github.com/mathiasbynens/dotfiles:
  .osx: Support multiple `systemuiserver` pref files
  .functions: Make `np` remove `node_modules`
  .aliases: Add `jsc` alias

Conflicts:
	.aliases
	.functions
	.osx
add Diffmerge ad difftool