v0.2500.0 - release preparation

From this point on, Package Control will use tags to identify releases and push those to users. So any commits between tags won't reach users as they do now.

We need to use **0.2500.0** as this release's name because of the way PC works — to make sure it starts using tags correctly based on this repo's metadata.

**Note:** The exceedingly high version number is there to satisfy Package Control requirements. Order will be restored when we hit 1.0.