Fixed issue #8 curcss jQuery alias

[reneras]

Due to deprecation of $.curCss edited to $.css

[vodkabears]

$.css(calEl, 'display') is it correctly? I think will be better to write $(calEl).css('display')

[marcguyer]

@vodkabears you're correct.

@reneras it should be $(calEl).css('display')

This fix is necessary as of jquery 1.8 since $.curCss has been removed.

[heathdutton]

Close in favor of #33