install libjpeg-dev on travis - required for thumbnail tests
install libjpeg-dev on travis - required for thumbnail tests

eHealthAfrica/formhub,awemulya/fieldsight-kobocat,ehealthafrica-ci/formhub,SEL-Columbia/formhub,piqoni/onadata,ehealthafrica-ci/onadata,jomolinare/kobocat,hnjamba/onaclone,hnjamba/onaclone,piqoni/onadata,mainakibui/kobocat,hnjamba/onaclone,sounay/flaminggo-test,smn/onadata,ehealthafrica-ci/formhub,makinacorpus/formhub,GeoODK/formhub,mainakibui/kobocat,kobotoolbox/kobocat,jomolinare/kobocat,eHealthAfrica/formhub,sounay/flaminggo-test,makinacorpus/formhub,qlands/onadata,qlands/onadata,SEL-Columbia/formhub,spatialdev/onadata,makinacorpus/formhub,GeoODK/formhub,GeoODK/onadata,mainakibui/kobocat,smn/onadata,awemulya/fieldsight-kobocat,ehealthafrica-ci/formhub,sounay/flaminggo-test,wesley1001/formhub,ultimateprogramer/formhub,smn/onadata,GeoODK/formhub,eHealthAfrica/onadata,eHealthAfrica/formhub,kobotoolbox/kobocat,makinacorpus/formhub,awemulya/fieldsight-kobocat,piqoni/onadata,qlands/onadata,piqoni/onadata,spatialdev/onadata,SEL-Columbia/formhub,wesley1001/formhub,wesley1001/formhub,ultimateprogramer/formhub,eHealthAfrica/onadata,smn/onadata,qlands/onadata,mainakibui/kobocat,jomolinare/kobocat,spatialdev/onadata,ehealthafrica-ci/formhub,jomolinare/kobocat,eHealthAfrica/onadata,hnjamba/onaclone,spatialdev/onadata,ehealthafrica-ci/onadata,ultimateprogramer/formhub,GeoODK/onadata,kobotoolbox/kobocat,kobotoolbox/kobocat,GeoODK/onadata,GeoODK/onadata,awemulya/fieldsight-kobocat,ehealthafrica-ci/onadata,SEL-Columbia/formhub,ehealthafrica-ci/onadata,ultimateprogramer/formhub,eHealthAfrica/formhub,sounay/flaminggo-test,wesley1001/formhub