Issue with IE and height: iniital

[rothlis]

Hi Dmitry,

On IE, an element just opened does't get its height reset to initial. After some research, IE doesn't seem to support height: initial, so I changed it to height: auto. This archives a similar effect and fixes the problem.

Here's my pull request: #2

Cheers,
Sebastien

[rothlis]

Thanks for the merge! Could you create a v0.3.1 tag?

[TheRusskiy]

done