Bug 1211866 - Update drf-extensions to v0.2.8
Bug 1211866 - Update drf-extensions to v0.2.8

http://chibisov.github.io/drf-extensions/docs/#0-2-8
https://github.com/chibisov/drf-extensions/compare/0.2.7...0.2.8

glenn124f/treeherder,wlach/treeherder,kapy2010/treeherder,KWierso/treeherder,sylvestre/treeherder,avih/treeherder,glenn124f/treeherder,KWierso/treeherder,sylvestre/treeherder,edmorley/treeherder,KWierso/treeherder,akhileshpillai/treeherder,sylvestre/treeherder,akhileshpillai/treeherder,gbrmachado/treeherder,wlach/treeherder,sylvestre/treeherder,akhileshpillai/treeherder,avih/treeherder,wlach/treeherder,akhileshpillai/treeherder,parkouss/treeherder,tojonmz/treeherder,glenn124f/treeherder,tojon/treeherder,wlach/treeherder,wlach/treeherder,gbrmachado/treeherder,akhileshpillai/treeherder,avih/treeherder,glenn124f/treeherder,KWierso/treeherder,parkouss/treeherder,parkouss/treeherder,glenn124f/treeherder,gbrmachado/treeherder,tojon/treeherder,avih/treeherder,parkouss/treeherder,edmorley/treeherder,gbrmachado/treeherder,tojon/treeherder,kapy2010/treeherder,kapy2010/treeherder,edmorley/treeherder,parkouss/treeherder,gbrmachado/treeherder,tojonmz/treeherder,sylvestre/treeherder,wlach/treeherder,kapy2010/treeherder,parkouss/treeherder,tojonmz/treeherder,sylvestre/treeherder,kapy2010/treeherder,gbrmachado/treeherder,avih/treeherder,akhileshpillai/treeherder,tojon/treeherder,edmorley/treeherder,tojonmz/treeherder,tojonmz/treeherder,avih/treeherder,glenn124f/treeherder,tojonmz/treeherder