Introduce TimeCap. Let raised exceed goal by introducing time_cap and hard_cap

[balqaasem]

With this upgrade, teams could have a goal (SoftCap), and a crowd_allocation that can be more than the value of their goal (SoftCap). This lets the team raise more than their goal by selling more, and their hard_cap = goal * token_price which is relative to their crowd_allocation / token_price;
The remaining_allocation will be returned to the campaign_creator when they claim the successful _campaign;

[balqaasem]

Descended from: Add soft_goal and hard_goal to CampaignInfo for more goal options and chances of success for Campaigns #21