Update version to 0.7.0; this version is ONLY COMPATIBLE WITH BACKBON…

…E >= 0.9.9!

Reverting the change in 6ada9b2, see PaulUithol#215

Version bump to 0.6.0; it's been too long. Lots of features added, bu…

…gs fixed!

Let's update the version in the .js itself as well ;)

Fix a small error in the readme's example