Adds option 'onAttributeModification' in arrive events.

Setting the option to true would make arrive event fire on existing elements which starts to
satisfy selector after attributes modification of DOM elements. Setting it to false would make arrive
event fire for only newly created elements.
Fixed #9 : Loading the library without jquery throws the error 'Uncaught ReferenceError: jQuery is not defined '
Merge remote-tracking branch 'origin/master' into dev
Rename options parameter from 'onAttributesModification' to 'fireOnAttributesModification'
Release v2.0.0
Merge pull request #10 from uzairfarooq/dev

Merge dev branch into master