[build] keep in sync with master
Merge branch 'jruby-1_7' of jruby.org:jruby into jruby-1_7
[build] fix the exclude for jdk6
redefine uri:classloader: meaning to be the parent classloader of runtime.getJRubyClassLoader

this allows to set JRubyHome to uri:classloader:/META-INF/jruby.home for all situations where
there is a jruby.home packed inside a jar.

fixes problem with loadService and knoplerfish OSGi

fixed missed test and cleanup javadocs and add more junit-tests for uri:classloader:
make IsolatedScriptingContainer work on felix-4.2.1 and probably on other osgi frameworks outside the pax test cases