Merge branch 'master' into fibers

Conflicts:
	fabfile/travis.py
	targettopaz.py
	tests/conftest.py
	topaz.mspec
	topaz/main.py
	topaz/objspace.py
fixes
fixup imports
(arigo, alex): progress
(alex, arigo) don't allow doulbe resume
(alex, arigato) mostly get fibers working
(alex, arigato) all the cases seem to work
handle yielding in main fiber
a missing test
don't allow resuming a dead fiber
handle args in first resume
reorganize
handle returns in blocks
handle raise breaks
resume with value works
handle yield with no args
Merge branch 'master' into fibers
Merge branch 'master' into fibers
More complete Enumerable#inject
Fix style, as per a comment on the pull request

https://github.com/topazproject/topaz/pull/533#discussion_r3440802