Changed .travis.yml to only build master and/or 2.** branches. Avoids triggering builds on changes to feature branches (which will be built when doing a PR anyways).
Changed .travis.yml to only build master and/or 2.** branches. Avoids triggering builds on changes to feature branches (which will be built when doing a PR anyways).

jason-p-pickering/dhis2-persian-calendar,vmluan/dhis2-core,msf-oca-his/dhis2-core,dhis2/dhis2-core,vietnguyen/dhis2-core,msf-oca-his/dhis-core,hispindia/dhis2-Core,vietnguyen/dhis2-core,jason-p-pickering/dhis2-core,vietnguyen/dhis2-core,dhis2/dhis2-core,uonafya/jphes-core,msf-oca-his/dhis2-core,jason-p-pickering/dhis2-persian-calendar,hispindia/dhis2-Core,troyel/dhis2-core,msf-oca-his/dhis2-core,troyel/dhis2-core,msf-oca-his/dhis-core,HRHR-project/palestine,jason-p-pickering/dhis2-core,dhis2/dhis2-core,vietnguyen/dhis2-core,vmluan/dhis2-core,jason-p-pickering/dhis2-core,HRHR-project/palestine,dhis2/dhis2-core,jason-p-pickering/dhis2-persian-calendar,dhis2/dhis2-core,uonafya/jphes-core,HRHR-project/palestine,troyel/dhis2-core,hispindia/dhis2-Core,vmluan/dhis2-core,vietnguyen/dhis2-core,vmluan/dhis2-core,HRHR-project/palestine,troyel/dhis2-core,jason-p-pickering/dhis2-core,hispindia/dhis2-Core,uonafya/jphes-core,vmluan/dhis2-core,jason-p-pickering/dhis2-persian-calendar,msf-oca-his/dhis2-core,HRHR-project/palestine,msf-oca-his/dhis-core,jason-p-pickering/dhis2-persian-calendar,jason-p-pickering/dhis2-core,msf-oca-his/dhis2-core,hispindia/dhis2-Core,msf-oca-his/dhis-core,uonafya/jphes-core,uonafya/jphes-core,troyel/dhis2-core,msf-oca-his/dhis-core