Remove bower version from JSON file

I suggest removing the version from bower.json, it is optional per the specs,  and during the release of 1.6.15 the version was not bumped, producing this error when installing:

```
bower extract       jQuery.dotdotdot#* archive.tar.gz
bower mismatch      Version declared in the json (1.6.14) is different than the resolved one (1.6.15)
bower resolved      git://github.com/BeSite/jQuery.dotdotdot.git#1.6.15
```