Change node create methods in band_presenter and favorites_presenter

- From innerText to textConent
- Mozilla does not support innerText
Add BandPresenter jasmine tests

- BandPresenter.present takes parsed band object from api and creates html nodes to append to dom
- Tests pass - compared output to expected html string
Merge pull request #100 from spring-peepers-2014/jasmine-unit-tests

Add band_presenter.js jasmine unit test.