Added mechanism to load saved theme from localStorage.
Tried very hard to load this via a single function run at onLoad, but couldn't get
it functional. The 'body' style was getting set properly, but the 'linkGroup' styles
were not, because at the time the function ran, those divs hadn't even been put on
the page yet by the angular controller (I was counting the number of divs having the
'link-group' name, and there were 0. However, running the same 'loadTheme()' function
from the console after loading resulted in '5' instances.