add images in tweet meta-metadata
Merge branch 'master' into images_and_externalurls
Merge branch 'master' of https://github.com/ecologylab/BigSemanticsWrapperRepository
Merge branch 'master' of https://github.com/ecologylab/BigSemanticsWrapperRepository
Merge branch 'master' of https://github.com/ecologylab/BigSemanticsWrapperRepository
Merge branch 'master' of https://github.com/ecologylab/BigSemanticsWrapperRepository