Merge branch 'release/0.2.7'
Merge branch 'release/0.2.8'
Merge branch 'release/0.2.9'
Merge branch 'release/0.3.0'
Merge branch 'release/0.3.1'
Merge branch 'release/0.3.2'
Merge branch 'release/0.3.3'
Merge branch 'release/0.3.4'
Merge branch 'release/0.3.5'
losslessly compressed the error message PNGs
Merge pull request #195 from ryanlerch/develop

optimized the error message PNGs