Part 1: Adds updated at min for projects

What this does
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 - This adds the updated at min parameter to all get requests for projects. 
 - This starts the date out at epoch time.
 - This adds properties for Part II (namely the fetch times).
 - Adds the unit tests.
 - Updates Project tests to use the proper STAssert methods.

cc @joshpc @j-mutter 

P.S. I think I got the testing done properly here... not 100% sure.