Use Travis to execute tests (#360)
Use Travis to execute tests (#360)

Alter .travis.yml to execute tests instead of building the artifact.
msf-oca-his/dhis2-core,dhis2/dhis2-core,troyel/dhis2-core,troyel/dhis2-core,dhis2/dhis2-core,vmluan/dhis2-core,jason-p-pickering/dhis2-persian-calendar,jason-p-pickering/dhis2-core,vietnguyen/dhis2-core,msf-oca-his/dhis2-core,vmluan/dhis2-core,jason-p-pickering/dhis2-persian-calendar,vietnguyen/dhis2-core,hispindia/dhis2-Core,vietnguyen/dhis2-core,msf-oca-his/dhis-core,msf-oca-his/dhis-core,vmluan/dhis2-core,vmluan/dhis2-core,msf-oca-his/dhis2-core,jason-p-pickering/dhis2-persian-calendar,jason-p-pickering/dhis2-core,jason-p-pickering/dhis2-persian-calendar,troyel/dhis2-core,jason-p-pickering/dhis2-persian-calendar,hispindia/dhis2-Core,msf-oca-his/dhis-core,dhis2/dhis2-core,dhis2/dhis2-core,vietnguyen/dhis2-core,msf-oca-his/dhis-core,jason-p-pickering/dhis2-core,jason-p-pickering/dhis2-core,hispindia/dhis2-Core,vmluan/dhis2-core,msf-oca-his/dhis2-core,troyel/dhis2-core,troyel/dhis2-core,msf-oca-his/dhis2-core,jason-p-pickering/dhis2-core,vietnguyen/dhis2-core,msf-oca-his/dhis-core,dhis2/dhis2-core,hispindia/dhis2-Core,hispindia/dhis2-Core