ability to render single-bit images
fix hash code implementation for private tags
update version number
fix hash code implementation for private tags
store hashcode to prevent repeated calculations
logging abstraction layer
Merge remote-tracking branch 'upstream/master'

Conflicts:
	ChangeLog.md
Merge branch 'master' into portable

Conflicts:
	DICOM/Imaging/Codec/DicomTranscoder.cs
	DICOM/Properties/AssemblyInfo.cs
Utilized new logging framework to facilitate MetroLog invocation