Disable caching (fixes tab refreshing)

Disable caching cards till a better caching
 mechanism can be found. The old method of caching
 meant that old data (or data from other tabs) was
 being restored. See comment in CardsFragment
 regarding caching.

Patch Set 2: Remove extra getAdapter() method I added
 oops.

Change-Id: I387596e88f9eb8ee3e77d4f59b5ac2219932a242