Added cache for data dictionary.
Added cache for data dictionary.

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