Eclipse: ignore gmaven

There is no connector or simple lifecycle mapping for the gmaven plugin
execution, and it does not seem to be necessary for developing code in
Eclipse, so configuration was added to the top-level pom.xml for m2e to
ignore gmaven.
Deltavision: do not warn if the ND is set to "BLANK"
Merge pull request #770 from melissalinkert/dv-nd-filter

Deltavision: do not warn if the ND is set to "BLANK"
Merge pull request #765 from hinerm/fix-eclipse-gmaven

Eclipse: ignore gmaven