Added explicit mongodb start to .travis.yml as per new docs
Added explicit mongodb start to .travis.yml as per new docs

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