Add test case for right floating png image shape-outside.
Add workaround for joint shadow problem.
Merge remote-tracking branch 'upstream/master'
Add test for right floating svg image.
Add test for right floating shape-outside, png image .2 image-threshold.
Reuse previously added reference file.
Add test for right floating png shape-outside with 70% alpha + shape-image-threshold.
Add data uri svg test with 70% alpha for right floating shape-outside and shape-image-threshold.
Merge remote-tracking branch 'upstream/master'
Remove opacity transition from the middle section.
Merge pull request #534 from zhorvath/master

Right float shape-outside: data uri {png, svg} + thresholds