Typo

Heavily -> Heavy
Merge pull request #205 from Phroa/patch-1

Typo in README
Added getPoweredFaces and getIndirectlyPoweredFaces to Block
Merge branch 'master' of https://github.com/SpongePowered/SpongeAPI into blockevents
Merge remote-tracking branch 'origin/blockevents' into blockevents
Add block break causes

Add license headers