Fixed 'yield' semantics.
crawlJar: goes in and searches the contexts of the .jar file
Removed the .class from the path of interfaces @implements, which fixed methodOVerrides
Removed extends from java/lang/Object
Fixed #419

The code assumed the directories where always first in a Jar file
Merge branch 'master' of https://github.com/cwi-swat/rascal
MethodOverride version2
Fixed 423 crawl library now works correctly with jars
Jarconverter mod
Merge branch 'master' of https://github.com/cwi-swat/rascal
crawlJar no longer needed as it was fixed in the actual Rascal according to @FerryRiet and @Marouli
Ignore Object superclass
Merge branch 'master' of https://github.com/FerryRiet/Rascal-clone into visitor

Conflicts:
	src/org/rascalmpl/library/lang/java/m3/internal/JarConverter.java