Feature: Build Monitor supports Cloudbees Folder plugin.

This change set closes #50 and #66, thanks to @suryagaddipati and @daniel-beck for their help and suggestions.

Please also note that this change requires Jenkins 1.532 or later.
Chore: upgraded JavaScript testing libs
Chore: upgraded maven-karma-plugin as it allows to specify karma executable that's not installed globally
Chore: Added other karma dependencies that need to be installed locally
Merge branch 'master' of github.com:jan-molak/jenkins-build-monitor-plugin