Use correct semver range to avoid resolution errors.

Prior to this change, this package would resolve its dependencies as the latest version of `angular` and `angular-touch` causing bower resolution errors when installing it, rather than being content with any `1.2` release, which I think is what you meant.

More information here: https://www.npmjs.org/package/semver#ranges
Merge pull request #46 from perry/patch-1

Use correct semver range to avoid resolution errors.