Fix prompt issue where text after prompt was bold.
Prevent Safari from opening safe downloads.

This is mostly useful to keep it from automatically extract ZIP files.
Load pathogen Vim plugin.
Better JavaScript and Ruby file type detection.
Move plugin configuration to the top.
Use list to show tabs and trailing whitespace.
Syntax highlight fenced code blocks in Markdown.
Add leader toggles for number, list, and spell.
Use dark red background color for bad spelling.
Ack all files, regardless of type.
Update OS X command for flushing DNS.
Remove ls color overrides.

Use the terminal settings to make the default colors easier to read.
Add (disabled) default for disabling the desktop.
Add defaults for fixing Messages key binding.
Add (disabled) defaults for shared memory.
Add /usr/local/{bin,sbin} to $PATH.
Add Heroku Toolbelt path to $PATH.
Replace emoji character in prompt.

Since OS X Mountain Lion added support for emoji, replace the old
character with a new one for better consistency in the prompt output.