fix order of operations for not operator
add parentheses to expressions resolves #59
Merge pull request #80 from golavender/fix-not-operator

fix order of operations for not operator
Merge pull request #81 from golavender/parentheses

add parentheses to expressions resolves #59
Merge remote-tracking branch 'origin/master' into bracket-notation

Conflicts:
	src/Lavender/extensions/expression.php