uix:GridLayout honour width/height for the col/row only if all the
widgets are setting size_hint_x/y to None. closes #954
Merge pull request #956 from kivy/gridlayout

uix:GridLayout honour width/height for the col/row only if all the
asyncimage: fix asyncimage widget with http resources + re-host the image on kivy.org
context: fix reloading of images from the network. Currently, the reloading happen on the Texture itself by using the Loader.image, but we lost the reloading gif. I guess we should handle the reloading in the AsyncImage maybe. closes #895