added ability for lenders to add funds to their account
added error handling to investment controller so lender can't invest more than available funds
added borrower rate to check-rate view
wrote a transaction script that allows lenders to quick invest with a total amount and max amount/investment
fixed a float bug in quik invest txs and ordered lender investments by created_at dat DESC
commiting, about to merge to master; will work on payments/index view pages for lendees/lenders