Add has, get, and set methods to Poco::Message for better control over accessing logging parameters.
Merge pull request #330 from syvex/feature/MessageParams

Add has, get, and set methods to Poco::Message
fixed GH# 332: POCO::ConsoleChannnel::initColors() assigns no color to PRIO_TRACE and wrong color to PRIO_FATAL
Merge branch 'develop' into custom
* HTMLForm test