Update _cards.scss

Select needs large width to hide dropdown arrow in IE11
Update _forms.scss

Moved height:80px onto input element as it seems IE11 is struggling with line-height alone
Update index.html

Adding spans after inputs to style in IE
Cross-browser fixes to form elements
IE8 fixes
Remove height on input in IE8
Placeholder fallback for IE8
Input fixes and improvments
Adding Selectivizr
Moving shiv and selectivizr
Adding incomplete class back in
Merge pull request #1 from cityandwool/master

Browser fixes