Added identifyFormat and deleteImageProperty functions.
Added setImageBiasQuantum, as the value is meant to be a quantum scaled value.
Merge pull request #58 from Danack/setImageBiasQuantum

Added setImageBiasQuantum.
Merge branch 'master' of https://github.com/mkoppanen/imagick into upstreamMaster

* 'master' of https://github.com/mkoppanen/imagick:
  Added setImageBiasQuantum, as the value is meant to be a quantum scaled value.
  Added identifyFormat and deleteImageProperty functions.