booleans accepted by the parser
add boolean support to compiler
Merge branch 'master' into booleans
fix exception name for boolean expressions
Merge pull request #68 from rapid-lang/booleans

Booleans
Merge branch 'master' into floats

Conflicts:
	compiler/generate.ml
	compiler/parser.mly
	compiler/sast.mli
	compiler/sast_printer.ml
	compiler/semantic_check.ml
	compiler/translate.ml