Update bundled rhino to latest version

This includes rhino 1.7.6 and 1.7.7:

- https://github.com/mozilla/rhino/releases/tag/Rhino1_7_6_RELEASE
- https://github.com/mozilla/rhino/releases/tag/Rhino1_7_7_RELEASE

Author: fornwall

README.txt

@@ -5,7 +5,7 @@ Read more at http://eclipsescript.org/.
 For development, an eclipse project containing some tests are available at:
 	https://github.com/fornwall/eclipsescript-tests
 
-This plug-in currently uses a re-packaged version of rhino in js.jar. This was built from rhino master git on 2013-04-11 using:
+This plug-in currently uses a re-packaged version of rhino in js.jar. This was built from rhino master git on 2016-01-12 using:
 	(1) Get the source (https://developer.mozilla.org/en-US/docs/Rhino/Download_Rhino?redirectlocale=en-US&redirectslug=RhinoDownload):
 		git clone https://github.com/mozilla/rhino.git
 		cd rhino
@@ -14,7 +14,7 @@ This plug-in currently uses a re-packaged version of rhino in js.jar. This was b
 	(3) Build:
 		ant jar
 	(4) 
-		cp build/rhino1_7R5pre/js.jar $ECLIPSESCRIPT/js_orig.jar
+		cp build/rhino1.7.8-SNAPSHOT/js.jar $ECLIPSESCRIPT/js_orig.jar
 		cd $ECLIPSESCRIPT
 		ant -f build_js_with_jarjar.xml
 	(5) Test the re-packaged rhino from shell with: