Removed outdated JSON implementation
Added convenience method and exception.
Commented out test that cannot be accepted by the type checker.
Added a version of util/Reflective for compiler
Added comments to refer to ReflectiveCompiled
Merge branch 'master' of https://github.com/cwi-swat/rascal.git

Conflicts:
	src/org/rascalmpl/library/util/Reflective.java
Added a compiler-compatible version of getSourcePathLocation