Migrating data to datastore

[maxsam4]

• Optimized Datastore (From 23.5kb to 11.5kb with 4 extra functions)
• Moved investor list to datastore
• Moved canBuy logic from GTM to STO
• Added Investor flags
• Renamed whitelist data to kyc data and moved flags to separate a uint256
• Added eth gas reporter (it reports gas usage in tests, run using npm run gas)

[coveralls]

Coverage increased (+0.03%) to 96.929% when pulling 86d5bab on universal-accredited into 32663e2 on dev-3.0.0.

[F-OBrien]

I had a read through this pull request and wanted to reference a feature request I had raised #532
related to canBuyFromSTO.
This pull request goes part of the way implementing my suggestion by removing the canbBuyFromSTO check from the GTM and including it in the STO contracts (and also moving the accredited status out of the STO contract) but I believe it is still the case that setting canBuy for an investor allows them to buy from all STO's and does not allow the possibility to apply different investor restrictions to different STO's.
I still think the ability to have concurrent offerings with certain investors only allowed to invest in one or the other may be a useful feature in a future pull request if not in this one.

[maxsam4]

Thanks for your feedback @F-OBrien! Different restrictions on different simultaneous STOs is a planned feature.

[Ttokkiyo]

ok lov u

[Ttokkiyo]

The mapping address is wrong D:

[satyamakgec]

What do you mean ?

[akashvekariya]

then this two variables won't be accessible