v1.0.6

Features:

• Add support for symfony/panther:0.8

Fixes:

• Catch LogicException when using not implemented getHistory introduced in symfony/panther 0.8
• Throw exception when using getClient and driver is not started.
  This ensures compatibility with https://github.com/Behatch/contexts
  see: Behatch/contexts#284