remove initial balance from EtherToken. Change *Approval to *Allowanc…

[robrobbins]

…e (and return bools). Update many specs.

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[robrobbins]

• see the two tickets actual code changes are only those
• majority of changes are to specs, particularly the creatorblock simulations. rsn for that is that they were using the ability to instantiate the ether_token with a balance. with that removed every test that utilized that "feature" had to have a step inserted where the owner made a deposit first. some other steps to increase owners/users ETH was implemented as well, since they need more funds to depsoit and still pay for gas etc...

[robrobbins]

These tickets pertain to TOB Audit issues No.3 and No.9

[rgrchen]

Reviewed and discussed with @robrobbins. Wanted to pressure test cryptoeconomic security by walking through a few launch scenarios and checking for unintended consequences. It’s looking good to me from that angle. Defer to @rbharath to give it a deeper look + code review.