Link to google charts in README.md does not get parsed (url linkification issue) (BB-11055)

The link

http://chart.apis.google.com/chart?cht=lc&chs=800x200&chco=326A9E&chxt=x,y&chtt=Test&chxr=1,0,55&chds=0,55&chxs=1N_s_&chls=3&chm=o,0066FF,0,-1,10,0&chd=t:0,10,8,12,1,7,9,2,32,14,11,55&chxl=0:|Jul2013|Aug2013|Sep2013|Oct2013|Nov2013|Dec2013|Jan2014|Mar2014|Mar2014|Apr2014|May2014|Jun2014

is not parsed when used for an image in the readme. The src attribute of the generated image tag is empty. I tried fixing it by encoding the 2 asterisks in the link. With that change the link then works on stackoverflow.com and on http://dillinger.io/. On both these sites the image is then displayed correctly. However not on bitbucket. I also tried to encode further character but to no avail. It just did not work. Since this works for other markdown viewers I consider this a bug.