Refactoring

Smarter generator for boolean expression
Changed test to check fully parenthesized expressions only, because
of ambiguous representation issues.
Removed old test for boolean expression

It is covered now using quickcheck
Merge branch 'master' of github.com:phile314/drunken-ants

Conflicts:
	src/antish/antish.cabal
	src/antish/src/Ast.hs