created a jvm_installer helper to handle all jdk installs and read sys props

fixed some jvm install bugs and updated tests
added a test for jdk8
added stack to jvm installer
made jdk8 the default on cedar-14
add jdk7/8 default tests for cedar/cedar-14 respectively
don't support ruby 1.9.2/1.8.7 anymore :)
fix ruby specs/jdk tests
remove more ruby 1.8.7/1.9.2 tests
fix tests that broke when cedar-14 GA'd