Add test spec functions on global vars in jshintrc
add testSpecs variable to use on lint and tests tasks
Fix lint erros on tests/spec/shim.js
Lint fixes on tests/spec/droptarget.js
Lint fixes on tests/spec/draggable.js
lint fixes on tests/spec/Inheritance / add comment on non working test
Fix lint errors on tests/spec/Rectangle.js
Fix lint tests tests/spec/ObjectProperties.js
Add xit/xdescribe in jshintrc / uncomment xit test
Merge pull request #510 from ellisonleao/master

Some changes on lint checking