New Select Desktop screen.
Temporal design
Change "Select Desktop" design
Option to select flavoured desktop installs or vanilla.
New desktops added
Modified packages.xml to have several desktop.
Modified postinstall script to split tasks acording with desktop
Fixed dancing widgets in "select desktop" screen
Merge branch 'master' of https://github.com/Antergos/Cnchi
Updated README.md
Added "Antergos" brand. CSS needs some love :p
Merge branch 'master' into alongside

Conflicts:
	data/css/gtk-style.css
	src/installation_ask.py
	src/installation_easy.py