Experiment: use karma phantomjs runner instead of Chrome for headless builds
support both Chrome and PhantomJS karma runners
Update browser for phantomJS runner
Bump version to 0.6.8
Merge branch 'karma-phantomjs' of https://github.com/shilman/meteor-jasmine into shilman-karma-phantomjs

Conflicts:
	package.js
Use karma-phantomjs-launcher-nonet to skip downloading PhantomJS again
Also use a map for "browser name" to "plugin name" mapping
Merge branch 'shilman-karma-phantomjs'
Bumps version to 0.7.0

Adds support for running client unit tests with
PhantomJS and Chrome Canary via JASMINE_BROWSER environment variable.