update power, reward and market actors, rt and registered proofs relative to miner actor

[dutterbutter]

Summary of changes
Changes introduced in this pull request:

Important to note, I only updated the parts of the actors that are used within the miner actor. There are still updates to be made to both reward and market actors. I will make a separate issue for each.

• Updates the power actor and removes unused methods, however, a lot of that logic has just been moved to the miner actor
• Updates reward actor
• Updates market actor
• Adds an additional function to runtime trait and updated delete_actor to include address param
• Updates registered proofs

Reference issue to close (if applicable)

Closes #455

Other information and links

• Specs actors repo

[austinabell]

wooo that was tedious to verify, great job on the changes though !

[austinabell]

This is sufficient to close #455 ya?

[austinabell]

Would be great to get someone else to verify against spec -- a lot of changes so possible I missed something

[ec2]

that was the hardest thing ive had to look at...