Add breakBlock param to createExplosion - Fixes BUKKIT-5350

**The Issue:**
Plugins should be able to create explosions, with locations, and specify if blocks should be modified.

**Justification for this PR:**
This PR just makes things a little bit easier (as so does the other createExplosion methods that allow a Location).

**JIRA Ticket:**
https://bukkit.atlassian.net/browse/BUKKIT-5350