Merge pull request #21 from headissue/nashorn

First steps to migrate from rhino to nashorn
Update Readme: Nashorn has been merged, we require java 8 now
Remove Rhino from pom
fix typo
move java example and ruby gem out of sahi-core
remove installer
Nashorn does not extend scriptrunner, scriptrunner deleted
Merge remote-tracking branch 'remotes/origin/nashornRefactor'

Conflicts:
	pom.xml
removed some windows files in the process. moved license