gplugin/gplugin

Merge in the glade and other gplugin-gtk work
develop
2018-05-06, Gary Kramlich
5d0314318fe1
Merge in the glade and other gplugin-gtk work
export GPLUGIN_VERSION=@GPLUGIN_MAJOR_VERSION@.@GPLUGIN_MINOR_VERSION@.@GPLUGIN_MICRO_VERSION@