Refactored contract with fixed bugs and loopholes#1

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Van0k wants to merge 13 commits intomasterfrom

refactor/abstraction

Commits on Aug 20, 2017

Improve contract abstraction with inheritance and composition
Ivan Kamakin
committed

Commits on Aug 22, 2017

Add proxy logic
ivkamakin
committed
Fix WhileNotFrozen modifier
ivkamakin
committed
Make token field public
ivkamakin
committed

Commits on Aug 24, 2017

Add freeze during presale
Ivan Kamakin
committed

Commits on Aug 29, 2017

remove unnecessary mapping 'migrated'
zidorov
committed

Commits on Sep 4, 2017

Fix proxy not sending funds to main contract
ivkamakin
committed

Commits on Sep 5, 2017

Commits on Sep 6, 2017