UI and algo improvement

mwcardex.js:
Updated filter algorithm
Detach spells from DOM before filtering for better performance
Uses em instead of px as unit

UI:
Uses em instead of px as unit
Restructured layout (better fit the mentality of responsive layout)
Removed nanoscroller
Changed orientation of wall spells
Added version info
CSS bugfixes

 On branch gh-pages
 Changes to be committed:
	modified:   .gitignore
	modified:   css/mycss.min.css
	deleted:    css/nanoscroller.min.css
	modified:   index.html
	deleted:    js/jquery.nanoscroller.min.js
	modified:   js/mwcardex.min.js
	modified:   mwcardex.appcache
	modified:   spells/mw1w01.jpg
	modified:   spells/mw1w02.jpg
	modified:   spells/mw1w03.jpg
	modified:   spells/mw1w04.jpg
added dev pages

 On branch gh-pages
 Changes to be committed:
	new file:   css/dev/mycss.css
	new file:   index_dev.html
	new file:   js/dev/mwcardex.js
	new file:   js/dev/spell_database.js

won't use app cache
resources are not minified
! for local development only !