grammata version 0.1.8.0

CHANGES
    - Added Procedures

TODO
    - Rearrange module structure
    - Unify error message format

	new file:   examples/procTest.gr
	modified:   examples/scopeTest.gr
	modified:   src/General.hs
	modified:   src/Grammata.hs
	modified:   src/Grammata/Execution.hs
	modified:   src/Grammata/Parser.hs
	modified:   src/Grammata/Parser.y
	modified:   src/Grammata/Parser/AST.hs
	modified:   src/Grammata/Parser/Lexer.hs
	modified:   src/Grammata/Parser/Lexer.x