Fixed crawling
Lots of functions to allow for easy usage :)
Merge branch 'master' of https://github.com/FerryRiet/Rascal-clone

Conflicts:
	src/org/rascalmpl/library/lang/java/m3/Core.rsc
	src/org/rascalmpl/library/lang/java/m3/internal/JarConverter.java
Fixed createM3FromJar (crawl thing, removed redundant code, replaced some code by a comprehension :D).

Seems to work properly on my end. Please verify ;)
 Added m.scheme == "java+method"  was intended refactoring removed intent.
Removed reflexive transitive closure operator , and made + a prefix.
Reverted changes to the comprehension;

-> * needed to get the output flattened instead of in a set.
-> + is to get the transitive closure; prefixing + is not possible

Added java+constructor to the schemes that should be checked.
Merge branch 'master' of https://github.com/FerryRiet/Rascal-clone into visitor

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