removed build status

The build status doesn't work because the image is cached by GitHub.
Shuts up PhantomJS logs. Uses new selenium.

- Also updates to Sonatype OSS parent 9
- JavaDoc and sources are generated for all poms
[maven-release-plugin] prepare release crawljax-3.5.1
[maven-release-plugin] prepare for next development iteration
fixing #408
fixing #397 again.
fix for #381 squashed/cleaned.
Merge pull request #409 from crawljax/fix408

fixing #408
Merge pull request #410 from crawljax/fix381cleaned

fix for #381 squashed and cleaned.
Merge pull request #411 from crawljax/fix397

fix for  #397
fixing #406
rethrowing the error without hiding.
Merge pull request #412 from crawljax/fix406

Fix for #406