Added method to make checkers a little more extensible
Made one-of and all-or-none aliases of presence instead of duplicating the function
split regular experessions out into an object
Merge branch 'precompile_regexps' into checker_improvements
Combined min/max/between-length/number checkers into just min/max/between checkers
Added min/max/between aliases for backwards compatability
Merge pull request #7 from chall8908/checker_improvements

Checker improvements