Deprecate LanguageUtils

- brooklyn.util.internal.LanguageUtils is a groovy class
- Did some very minor cleanup, and deprecated it
  so we are free to completely change it in 0.6!
Fix WebAppIntegrationTest

- ensureTomcatIsShutdown needs dependsOnMethod="shutdownApp",
  otherwise fails because nothing previously asked tomcat
  to shutdown.
Merge pull request #630 from aledsage/fix/LanguageUtils-deprecate

Fix WebAppIntegrationTest, and deprecate LanguageUtils