More metric types

Nice work on metrics-watcher.

In this PR I added some metric types to support several of the available instrumentation types in Metrics like ehcache, jvm, and web server.

Sorry for the large diff, I couldn't help refactoring the javascript as I went about adding these features. Some of the other changes include namespaced javascript and css, fluid row layout and removal of some unused markup.

Let me know if you have any questions.