PhilJay/MPAndroidChart — pull request #82 by driventokill (2014-09-11 18:31:03+00:00)
Title: centering Legend in PieChart which has a big hole

1. fix getMaximumEntryLength in Legend
I think the legend length should be ```formSize + textWidth +
formToTextSpace``` and I don't really understand the former code.
If I was doing something awful or messing it up please let me know.
2. I think the PieChart's legend should inform people what every single
slice is. It is different from other charts like line or bar which
shows several DataSet.
3. There is a big hole inside PieChart, maybe we can make good use of
it. The sample code is updated and you can find out if this could
be acceptable. Thanks.