Update StandardHipChatService.java

Use the Jenkins proxy settings if they are set to connect to internet.
changed to use static Jenkins class and renamed method
Merge pull request #34 from thatguy1177/master

Added proxy settings, pulled from the Jenkins proxy settings.
Use BuildStepMonitor.NONE unless you have a compelling reason to use something else.
Merge pull request #57 from jglick/no-blocking

Use BuildStepMonitor.NONE