Open modal windows depending on URL hashes
Logic is as follows:
 * If we're on Australis, and there are no hashes, open the #choice modal
 * If we're not on Australis, and there are no hashes, do nothing (stay on map)
 * If #choice, #video, or #number are in the URL, open the corresponding modal
Merge pull request #9 from sgarrity/download-button

Open modal windows depending on URL hashes