Modified several mockup files

index.html
	-shifted structure to Bootstrap layout style
	-module search is now a collection of divs instead of <options> in a <select> tag.
	-all module titles in the skill tree are now centered

custom.css
	-shifted CSS towards Bootstrap style following index.html
	-several major modifications

modules.json

	-slight modifications

script.js
	-added live loading of tiny module repository (JSON)
	-added loading of module into skill tree

skillTree.js
	-Altered style of joining lines to a 'flowchart' style.