add x2Axis in nvd3.r
fix toChain for x2Axis in nvd3.r
update chart.html for nvd3 to include x2Axis
add test in examples.R for x2Axis and xAxis
test xAxis to default change x2Axis unless already specified
add conditional xAxis set x2Axis if missing and lineWithFocus
one more try turning off conditional
working so now turn conditional if then back on
just turn on check for lineWithFocus
fix error should be lineWithFocusChart not lineWithFocus
ok that fixed it so now add back length check on x2Axis
add tests in examples.R for x2Axis
Merge pull request #119 from timelyportfolio/master

add nvd3 x2Axis for lineWithFocusChart and tests