Fix w3c validator issues.
Fix w3c validator issues.
Fix w3c validator issues.
Fix w3c validator issues.
Fix w3c validator issues.
Merge pwo/buildbot:w3c-validator (PR #1080)

+autopep8
Docs: add an 'import' in one spot to make the recipe easier to swallow
Merge pull request #1081 from jaredgrubb/doc-props-add-import

Docs: add an 'import' in one spot to make the recipe easier to swallow
fix pngstatus if the build is currently in progress
Merge kviktor/buildbot:png-status-building (PR #1082)