Goal view - Added goal payments adapter

@josemontesdeoca @fcduarte please review. 

 I somehow messed up last pull request. Few points to discuss:

I have changed amount columns to Double from Float. Parse seems to be more friendly with Double. 
I am create two packages: utils and adapters. 
Transaction seems to have a field called createdAt. Parse automatically adds createdAt field for all ParseObject. If we must need another separate field. Let's rename it to txnDate. I have commented out createdOut form Transaction for now.