adding selectivizr (and some minor fixed), plone/mockup#357

* add selectivizr, a utility that emulates CSS3 pseudo-classes and attribute
  selectors in Internet Explorer 6-8
  [garbas]

* all files in tests/ and js/ folder are now included in karma test runner
  [garbas]

* update node packages:
    - coveralls: 2.8.0 -> 2.10.0
    - grunt: 0.4.3 -> 0.4.4
    - grunt-contrib-jshint: 0.8.0 -> 0.9.2
    - grunt-contrib-less: 0.10.0 -> 0.11.0
    - grunt-jscs-checker: 0.4.0 -> 0.4.1
    - grunt-karma: 0.8.0 -> 0.8.2
    - karma: 0.12.0 -> 0.12.1
    - karma-coverage: 0.2.0 -> 0.2.1
    - karma-mocha: 0.1.1 -> 0.1.3
    - karma-sauce-launcher: 0.2.0 -> 0.2.4
    - mocha: 1.17.1 -> 1.18.2