Merge pull request #10 from stephanebachelier/master

change bower main to an array
Include AMD
refactor(umd): insert umd wrapper

fixes issues that prevent this plugin to work with requirejs:
 * no more define package name
 * export as root.Swiper
 * better lint
chore(grunt): build a single umd version

As lots of others mainstream libraries does :P
Even Backbone switch to umd!
chore(jshint): add define to globals
feat(hashnav): build new umd version