TODO

* Implement matchers (stolen from jspec):

 - equal            === (IdentityMatcher)
  - be_a, be_an      have constructor of x (InstanceMatcher)
  - be_at_least      >= (ComparisonMatcher)
  - be_at_most       <= (ComparisonMatcher)
  - be_null          == null (IdentityMatcher)
  - be_empty         length of 0 (IdentityMatcher)
  - be_true          == true (IdentityMatcher)
  - be_false         == false (IdentityMatcher)
  - be_type          be type of x (TypeMatcher)
  - be_greater_than  > (ComparisonMatcher)
  - be_less_than     < (ComparisonMatcher)
  - be_within        checks if x is within the range passed (RangeMatcher)
  - have_length      length of x (EqualityMatcher)
  - include          include substring, array element, or hash key (InclusionMatcher)
  - match            string should match regexp x (RegexMather)
  - respond_to       property x should be a function (TypeMathcer)
  - eql, be          matches simple literals (strings, numbers) with == . (EqualityMatcher)
                     However composites like arrays or 'hashes' are recursively matched,
                     meaning that [1, 2, [3]].should_eql([1, 2, [3]]) will be true.

* Implement sandboxed scopes in test execution
* Write README
* write Documentations
* Better error messages
* Add Parsers to parse loaded specs before eval (support for better syntax)
* Implement a better HtmlReporter
* Implement a ConsoleReporter
* Implement JScriptEnvironment
* Implement RihnoEnvironment
* Add default options