Followup: Better release process

[parasyte]

Followup to #508

We should consider the following options:

• Add a new grunt task to bump the version
• Release non-versioned build files

The former is pretty obvious, and could be done as part of grunt release.

The latter is more of a political matter. All popular frameworks release build files without a version number in the filename. This allows easy updates for minor versions; bower update is all you need. Or even CDN releases that automatically propagate to CDN users. (But this is dangerous, as any changes may introduce new bugs that break CDN games without warning!)