Merge pull request #246 from vwiencek/feature/prepgui

add environment parameter to pluginOperation
Multiarch plugins; relates to #204
Allow multiple JAR uploads in plugins
Try gradle property instead of system property
Defer execution of task to let other tasks work
Speed up gradle by enabling daemon
Merge branch 'develop' into feature/multiarch
Fix(?) plugin issue
And again
Use v2 of API; Extend plugin info object
Fix EnvironmentUtil to work with 'amd64' string
Update CHANGELOG.md