added ability to set initial open element in accordion using URL hash fragment
Actually assign correct index

If the new index is zero (first tab) then the condition will always fall back to this.index.
Merge pull request #39 from patrys/accordion-zero-index

sorry for the delay, but had to write tests for it as well!
Merge pull request #38 from piquadrat/feature/accordion-deep-link

added ability to set initial open element in accordion using URL hash fragment
write test for issue #39
added more simple version for hashtag
added travis file
added travis batch