remove redundancy with the 2 separate import functions

a little less redundancy than previously
(0eb3199813bceafaf2df3495316a732fef7e5680), works with me, might need
some more testing though.

downsides:
* count counts all tweets ever, but the twitter API does not return all
tweets. aborts gracefully though.
* fav endpoint does not allow as many calls as the other apis. if
$count is set to 10 or 20 or even 50, not all favs can be grabbed befor
we hit the API limit (thats why there are 2 count limits, one for
normal calls, one for fav calls)