Rename join: to joinBy:
add NSDictionary categories array, array:^mapFn, map:mapFn, toQueryString; add NSString category encodedURIComponent
Show network spinner while api requests are in progress
fix base headers
rename idInt to num
hide the overlay whenever there is an error
Add SQL insert, insertMultiple, insertOrReplaceMultipleInto:
Add useful Overlay, but it is broken and currently disabled. Have to figure out how to properly deal with mutliple UIWIndows
Put the API response callback on the main queue