Log Message:
2014-01-25: Version 1.9.7
* Reverted to GhostDriver 1.1.0 instead of 1.1.1 (issue 11915)
* Fixed another warning of obsolete userSpaceScaleFactor on OS X 10.9
  (issue 11612)

2014-01-20: Version 1.9.6
* Updated GhostDriver to version 1.1.1 (issue 11877, 11893)

2014-01-19: Version 1.9.3
* Fixed CoreText performance note on OS X 10.9 (issue 11418)
* Fixed warning of obsolete userSpaceScaleFactor on OS X 10.9 (issue 11612)

2013-09-06: Version 1.9.2
* Fixed graphical artifacts with transparent background on Windows
  (issue 11276, 11007, 11366)
* Updated GhostDriver to version 1.0.4 (issue 11452)