Add python 3.4 for tox
Add new config option for hiding all dots except major labeled ones
Test new 'show_only_major_dots' option
simple graph with 'show_only_major_dots' option
Merge branch 'master' of https://github.com/Kozea/pygal
Updated XY and DateY to accept Range parameter
This fixes issue 79: https://github.com/Kozea/pygal/issues/79
Used the latest range calculations from https://github.com/Kozea/pygal/issues/115 to accept 0 in the range parameter.