Rename ACH Payouts to ACH Credits

[dmdj03]

We should call it "ACH Credits" to be consistent with its counterpart, "ACH Debits." "ACH Credits" also maps well with what we're calling it in the API and Dashboard: "credit." There is no "Payout" resource. We can still reference "payouts" as a description in speaking about ACH Credits. To facilitate an easier understanding of what these terms mean, we can classify them under buyer and merchant actions on the website.

Proposed navigation:

Charging buyers
-Card processing
-ACH debits
-International payments (may split this up when international payouts are available)

Paying merchants
-ACH credits
-Push to card

Features
-Account reconciliation
-Analytics & reporting
-White label ?

Solutions
-Goods & Services
-Crowdfunding & Donations
-Ecommerce platforms

Customers

Pricing