Updates install script

Removed the old '-d' option, made future configuration (hopefully)
easier.
Adds ~/.local/share/applications directory

Desktop entry files can be added to this directory to add entries to the
desktop-environment's launcher menu, in compliance with the
freedesktop.org spec:
http://standards.freedesktop.org/desktop-entry-spec/latest/

Entry files for `uzbl` and `uzbl-tabbed` have be added, as the Debian
package is missing them.
Adds high-resolution icons for uzbl

Support for the ~/.icons directory has been added. An svg icon and
prerendered png icon formed from the logo on the ubzl Wikipedia page has
been added. The desktop files have been updated accordingly to map to
these new icon files.
Adds syntax highlighting for uzbl

The vim bundle has been extracted from the uzbl git repository.
Adds profile and zprofile files

`PATH` manipulations should be moved into ~/.profile, and other
environmental variables that may be needed by applications on the
system should be defined in the profile.
Provides extra aptitude aliases for zsh

I've found myself using a few extra features of aptitude a lot lately,
so adding aliases for them should save quite a few bothersome
keystrokes.

- `aptp`  => `aptitude purge`
- `aptw`  => `aptitude why`
- `aptwn` => `aptitude why-not`