Keep chart-legend on larger resolutions for IE

IE sucks and does not render foreignObjects thus we should
keep the legend because the axis labels won't be shown.

Also the chart height was adjusted for smaller resolutions, so the
legend would overlap the axis label text. This is necessary because
display:none and visibility:collapse is not working for the axis label.
Add manual feature detection for SVGForeignObject

Is better to use feature detection, since IE10 does not support comment
tags and jQuery +1.9 deprecated browser detection

Note: Couldn't find a way to use modernizr for this particular element
Merge pull request #27 from wilhelmbot/ie-sucks

Keep chart-legend on larger resolutions for IE