Fix #72 - Custom API server name now works with or without trailing "/".
Disable auto-correct/text suggestions for the custom API server URL
preference text entry.
Issue #72 - Clarify to the user what is expected in the "OneBusAway API
Server" preference text box by adding a hint.
Issue #72 - Only prepend "http://" for custom API URLs if the user does
not enter a scheme.
Merge pull request #78 from CUTR-at-USF/issue72

Issue #72 - Fix confusing issues around a custom API server