first pass at implementing "File Based List of Parameters"  https://issues.jenkins-ci.org/browse/JENKINS-21470
Merge pull request #2 from timbrown5/master

Get status of remoet trigger (This also has the option to block until remotejob is not busy and block local build until triggered build is complete)
Merge remote-tracking branch 'Jenkins_Group/master' into dev

Conflicts:
	src/main/java/org/jenkinsci/plugins/ParameterizedRemoteTrigger/RemoteBuildConfiguration.java (resolved)
setting a default polling value of 10 seconds
Cleaning up the Jenkins console log output. Removing all URL's that were begin printed out (they are just commented out) since this could be a security issue for public environments.
Merge pull request #2 from morficus/dev

Merging in dev branch
updating change log
updating screenshot and read me file
[maven-release-plugin] prepare release Parameterized-Remote-Trigger-2.1
[maven-release-plugin] prepare for next development iteration
Added a fix for issue Jenkins JENKINS-22325. The issue is that when using the 'build' URL to trigger a job without parameters we don't jsut a JSOn response back. This makes sendHTTPCall fail when it tries to create a JSON object out of the response. The fix is to check if the response is empty and if so return null from sendHTTPCall. This means any call to sendHTTPCall will have to be checked for 'null responses.