Upgrade whole stack
web: Add Jetty GzipFilter

Added servlet filter to compress javascript and returned data from Api.
travis-ci: Cache maven dependencies
Merge pull request #9 from matobet/upgrade

Upgrade whole stack
Merge pull request #10 from matobet/gzip

web: Add Jetty GzipFilter
server: Fix all scala-related warnings
Merge pull request #12 from matobet/travis-cache

travis-ci: Cache maven dependencies