First version of ASTComparator
Merge branch 'parser' of https://github.com/swp-uebersetzerbau-ss13/fuc into parser

Conflicts:
	code/parser/test/swp_compiler_ss13/fuc/parser/M2CondTest.java
	code/parser/test/swp_compiler_ss13/fuc/parser/M2PrintTest.java
Implemented ASTComparator