Add appengine mailgun sample#102

Merged

lesv merged 3 commits intomasterfrom

Mar 15, 2016

Commits on Mar 3, 2016

Add appengine mailgun sample
Shun Fan
committed
Update parent pom with appengine mailgun
Shun Fan
committed

Commits on Mar 10, 2016

Add licenses and extra lines to mailgun
Shun Fan
committed