Change format of Service Messages

Hello!
This reporter don't work because of bad format of service messages (at least in Teamcity 8.1.5).
As you can see in [documentation](http://confluence.jetbrains.com/display/TCD7/Build+Script+Interaction+with+TeamCity#BuildScriptInteractionwithTeamCity-ServiceMessages), Teamcity can't process messages with double quotes, so I just switch them with single.
Another problem is that  you starts test suite for every file, but [close it only in case of errors](https://github.com/wurmr/jscs-teamcity-reporter/blob/ada794bb396fc85caea13df9d57076844aaae802/teamcity-reporter.js#L23), and that lead to bad behaviour when Teamcity parses this messages.