Bug fixes :
  => Orange 3G was never set on the chart
  => Unknown network class went consistently to Orange2G use percent or FreeMobile 3G use percent.
  => Improved STAY_STICKY kitkat workaround, but still poor chance that it will work.
+
Splitted PieChart and MobileNetworkChart for a more modulable code.
Tried to fix incoherent percentages sums.
Merge pull request #5 from gilbsgilbs/master

Mainly bug fixes and code restructuration