Fix OFFSITE_HOST when not set.
Merge pull request #121 from emartinez-usgs/LATESTEQ-243

Merged.
turned on zoom animation
Merge pull request #123 from jdbrown-USGS/zoom

turned on zoom animation
Cache event pages in past 7 days for 1 minute, older for 15 minutes
extend cache for events after 30 days
Merge pull request #124 from jmfee-usgs/caching-headers

Cache event pages in past 7 days for 1 minute, older for 15 minutes
Changed version number in package.json.