Progress Dialog

Added a progress dialog for when data is being pulled from Yahoo
servers and made it so that when the watchList is empty the buttons and
textviews are invisible to the user until a new stock is added
Graphs working

Stuggled with getting the dates and times working correctly for the
graphs, but they are working now. Couldn’t get the recommended method
to work as the unix timestamp is a long and the graph takes in a
double, so some accuracy is missing and some dates in the year graph
are wrong (dates that the market was closed) That would be the only
noticeable affect from it, I believe.