fix search for favicon.png
some cleanup on ngix interface
Merge branch 'master' into ildipo/performance
Address bug 822

Serve static page directly from nginx.
Some rework of plugin launcher and on nginx configuration.
added mime type file
rollback closure change to support java 7
fixed favicon delivery
Merge remote-tracking branch 'origin/master' into ildipo/performance

Conflicts:
	core/src/main/web/app/template/index_template.html
Merge branch 'origin/master' into ildipo/performance
updated build scripts to integrate with twosigma internal build
cannot remove sub-package META-INF
Merge remote-tracking branch 'origin/master' into ildipo/internalstuff
Groovy evaluator is separated from its REST API.
Java and Groovy now have execution interrupt.
Merge branch 'ildipo/internalstuff' of https://github.com/twosigma/beaker-notebook into ildipo/internalstuff
add python3 plugin, still missing backend selection and py1/2 crossover
more of the python3 plugin
remove non-src files
first cut at selecting conda environment
updated external interface to better support internal plugins
Fixed paths on windows