Very initial version of sorted matcher support.
Renamed Sorted to Sortable.
Reimplemented Sortable returned from sortEnablersForSeq in Matchers.
Added support of 'xs should not be sorted' to matchers.
Added a test to ensure that TestFailedException is thrown with correct stack depth when empty collection is used with should not be.
Added 'xs shouldBe sorted' matchers support.
Added tests for 'xs shouldNot be (sorted)' syntax.
Added sorted matchers support to inspector shorthands.
Added support of logical expression and/or to sorted matchers.
Completed sorted matcher's implicit and explicit Sortable support.