version to 2.15.0
version to 2.15.0

* break out common config helpers to share between runner/view #221
* move common view helpers into top level file; test them #222
* reorg the view base class and default view #223
* have runner describe how tests are going to be run #224
* remove the `ansi` gem as a dependency #225
* simplify, standardize view constructor #226
* simplify runner run method; remove suite/view injection #227
* have tests capture their data in a specific "data" object #228
* have results capture their data in a specific "data" objects #229
* test/unit handling cleanups #230
* rework test/result data handling; allow building from data hashes #231
* update `slug` factory; don't have it include dashes #232
* bugfix: include the test backtrace on skip tests #233

/cc @jcredding

riddochc/assert,redding/assert