Squashed commits:
[50607a9] build dist
[ff0c00b] Allow negative numbers to be passed to parseHeight function test case fix
[3ecc1ca] Allow negative numbers to be passed to parseHeight function test case
[d20f670] Allow negative numbers to be passed to parseHeight function fix
[0816163] Allow negative numbers to be passed to parseHeight function
[aa18c63] rebuild dist
[601b5d5] setGridWidth api documentation udpdate
[c309856] Add a parameter to setGridWidth method to allow not to propagate resizing to widgets.
[ea442d1] drag between grids
[50ce614] jqueryui + requirejs note
[3d8a8e1] drag between grids demo
[446dade] drag from sidebar/between grids
[e31d50e] check if element setup before detach
[67274f8] trash zone is accepting only widgets
