run qunit tests when watching test changes

restored missing 'qunit' command when watching test files for changes
rename API from .forcesRelevance to .relevance

- updated all tests
- updated src
ready for distribution

- update version to 1.1.0
- generate distribution
- remove other references to 'forces'
support legacy API

can still use .forcesRelevance()
additional tests for legacy API

- copied plugin fixture
- run plugin tests
generate legacy API distributable

- added grunt-contrib-concat
- generate legacy API support in jquery.forces.relevance.js
- add non-uglified distributables