update of error messages thrown by latest version of PHP-Parser
changed grammer like the way it was changed to be work with rascal
re-added PHPParser_Node_Stmt_Expr class to new PhpParser namespace
added test files for Parser for rascal, using the same files as PhpParser\Parser
(re)moved file and added functions to generate tests files for rascal ast parser
re-added the Node_Stmt_Expr implementation in the new format of PhpParser namespace
update of code generator to be able to work with the PhpParser namespace and generate all the methods for the (old and) new class(es)
refactored the parser, moved the AST2Rascal class to a seperate file, and 'moved' the command line call logic to Parser.php