Added support for WebOb, used by Pyramid (and other frameworks).
Added support for WebOb, used by Pyramid (and other frameworks).

bsulcer/ims_lti_py,harvard-dce/dce_lti_py,nikolas/ims_lti_py,UbiCastTeam/ims_lti_py,tophatmonocle/ims_lti_py,brainheart/dce_lti_py,mitodl/ims_lti_py