Maven deployment and dependency management

Ant maven targets for deployment to Maven Central.
Dependencies are fetched using maven.
JSLint tests.
IDEA project files
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
Merge branch 'feature/idea-project'
Fail on JSLint errors.
Fix JSLint errors and disable one JSLint check on javascript: URLs.