Merge pull request #29 from ibyron/develop

Update .travis.yml to run legacy run_pi
Update README.md to link to travis-ci.org/grnet
Update .travis.yml with grnet encryption
Update .travis.yml with grnet env encryption
 ES-146 first changes based on feedback
ES-146 changes
ES-146 more changes
ES-146 with proposed changes
ES-146 with proposed changes
ES-146 with proposed changes
Merge branch 'ioannisstenos-develop' into develop