FIX: When refreshing stories go to search and wait until stories are done downloading.  When coming back from search we are at the wrong content offset and the refresh control appears.

When searching for another term clear the datasource before reloading table.
Updated color and size of text to reflect map's bookmark's "No Bookmarks" text.
fixed misplacements
Using current api server's hostname instead of hardcoding www.mit.edu
Merge branch 'refs/heads/3.6/ipad-news' into 3.6/news-search
Switched Indicator and Text View Positions.

Added search placeholder.

Added "Loading" text in addition to loading indicator.

Modified when view is dimmed when searching.
Merge pull request #286 from MIT-Mobile/3.6/news-search

Error messages and concurrent searches.