anchor.diff:  /// [omit]
   let tcBuildNumber = environVar "BUILD_NUMBER"
   
  +/// Build number retrieved from Travis
  +/// [omit]
  +let travisBuildNumber = environVar "TRAVIS_BUILD_NUMBER"
  +
   /// Build number retrieved from Jenkins
   /// [omit]
   let jenkinsBuildNumber = tcBuildNumber
  
positive.code:     | Jenkins ->    getVersion jenkinsBuildNumber
      | TeamCity ->   getVersion tcBuildNumber
      | CCNet ->      getVersion ccBuildLabel
      | LocalBuild -> getVersion localBuildLabel
  
  /// Is true when the current build is a local build.
  
negative.code:     if hasBuildParam "jenkins_home" then Jenkins else
      if not (isNullOrEmpty tcBuildNumber) then TeamCity else
      if not (isNullOrEmpty ccBuildLabel) then CCNet else 
      if not (isNullOrEmpty travisBuildNumber) then Travis else 
      LocalBuild
  
  /// The current build version as detected from the current build server.
  