- major
 - the major version
 - minor
 - the minor version
 
Documentation for this section has not yet been entered.
Obtains a specific version of this protocol.
 This can be used by derived classes to instantiate themselves instead
 of the base class, and to define constants for commonly used versions.
 
 The default implementation in this class returns this
 if the version matches, and creates a new Org.Apache.Http.ProtocolVersion
 otherwise.