Add license-info page to main opentree webapp.

Also adjust formatting of the project's BSD 2-clause license for easy
viewing on the web, and restore numbered list items as shown in the
specimen here: http://opensource.org/licenses/BSD-2-Clause
Add license link to main template in curation app
Progress on LibreJS compliance (ongoing)
Add license page + all 'opentree' webapp licenses

This should allow validation of the main webapp with the LibreJS plugin.
(I've tried testing locally, but it stalls Firefox.)
Merge pull request #322 from OpenTreeOfLife/license-information-page

License information page + more JS license tweaks