chore: release v0.6.1
chore: rename this shit to Karma

BREAKING CHANGE: this breaks in couple of ways
- whenever you call the "testacular" binary, change it to "karma", eg. `testacular start` becomes `karma start`.
- if you rely on default name of the config file, change it to `karma.conf.js`.
- if you access `__testacular__` object in the client code, change it to `__karma__`, eg. `window.__testacular__.files` becomes `window.__karma__.files`.
chore: set node dependency to a fixed version (0.8, 0.10)
chore: update contributors
chore: release v0.8.0
chore: change twitter to @JsKarma