Maven deployment and dependency management

Ant maven targets for deployment to Maven Central.
Dependencies are fetched using maven.
JSLint tests.
Pull in required resources for testapp from echo3

Resources were copied from echo3 pointed at by an
environment variable before.
Add Travis CI language description file
Merge branch 'feature/maven-deployment'
Merge branch 'feature/travis-ci-support' of https://github.com/ceari/echo3chart