Initial copy of opentree Bootstrap (& less) files

These files are copied as-is, including less source files (see less/README.md). This will initially match the look of the opentree web app, but allows for distinctive branding in forked versions of phylografter.
Modified bootstrap/less README for phylografter.
Add custom stylesheet (default.css) from opentree.
Basic support for Twitter Bootstrap (ongoing)...

Next we should sweep all major pages and views, and compare them to the
previous phylografter to make sure all features and behavior are intact.
Bootstrap-compatible styles for DataTables plugin

This is slightly modified from the old 'demo_table.css'.
Cosmetic fixes for phylografter with Bootstrap
Collapsing one-item navbar into clickable item.
JS to style 'flash' msgs, validation errors for BS
Consolidated layout templates based on Bootstrap.

Replaced layout_right_sidebar.html with universal layout.html template, triggering the right sidebar explicitly in views that need it.
Merge pull request #83 from OpenTreeOfLife/twitter-bootstrap-integration

Twitter bootstrap integration - issue #14