Merge pull request #25 from ishields/grid-stack-animation

Add option for animating gridstack with css transitions
add `data-gs-animate` attribute
set animation after grid initialization
minify files
update docs
update jquery ui requirements
show parameters as code block
typo
fix auto-positioning
add `will_it_fit` API method
update docs
minify file
typo
fix widgets packing in float mode
minify js
update docs
locked widgets
update docs
minify js
fix locked for not floating grid