Added code to adjust the graph's time axis to show only the time range
of the data plotted.
Merge pull request #253 from mbucknell/NAWQAAN-232

Added code to adjust the graph's time axis to show only the time range
Modified TimeSeries to set the timeRange property from the retrieved
data if the time series is created without the timeRange property. 

Modified GraphPopup to adjust the x axis using the timeRange from the
visualization (which is the correct way to do it anyways).

Made other visual tweaks including descreasing the padding between the y
axis label on the load plots and making the MRB load popup longer.
Reverted the change which shouldn't have been committed.
Merge pull request #254 from mbucknell/NAWQAAN-232

Nawqaan 232
Merge pull request #252 from mwernimont/master

ticket 230
Added database models for the site_mean_and_targets and
site_moving_averages table.

Created a new view which will retrieve data from these two tables by
constituent and site_id and return a json object. Updated the tests to
test this new view. Added a url conf which will use this new view.
Merge pull request #255 from mbucknell/NAWQAAN-65

Added database models for the site_mean_and_targets and
URL to url