Regression test for issue #2264
expand path before adding it to the $CLASSPATH variable

fixes #2216
get the $CLASSPATH variable right and allow proper URL as well

adjusted some specs to check for path expanded entries. #2216
Merge pull request #2268 from johnmuhl/jruby-1_7

Regression test for issue #2264
[Truffle] Implement just enough of Rational and Complex for language specs.
[Truffle] No need for isTruthy in DispatchHeadNode.doesRespondTo.

* It is the basic respond_to? which just says whether there is a method
  and therefore result can only be a boolean (unless impl bugs).
[Truffle] Splat should call the real respond_to?.

* We might want a node for this pattern.
[Truffle] DispatchHeadNodes using doesRespondTo should have RETURN_MISSING.
Fixes #2258. Encoding issue with backticks
Merge with jruby-1_7
Now that 2.0 is released of jnr-ffi the snapshot disappeared