Fix typo in ShowSonarAsWebView.
Add menu item to clear violation/source cache.
Add icon to tool window.
Update version to 1.0.4 in preparation for release.
Update version to 1.0.5-SNAPSHOT in preparation of more work.
Update README.md
Merge pull request #18 from aheusingfeld/patch-1

Update README.md
Add null check for getSource.
Update version to 1.0.5 in preparation for release.
Merge branch 'master' into 11.x
Update pre-built 11.x version.