support --backend as a pytest flag to limit to one backend for testing
pass posargs via tox so --backend can be used for tox envs
don't mutate _ALL_BACKENDS
better name for the variable
modify backend selection to allow multiple backends via comma delimiter
docs for explicit backend selection and document name attribute of backend
revert fixture decorator for now, switch to append. no more globals
update docs for name attribute
fix docs
On OS X at build time compile the CC bindings
Merge pull request #487 from alex/install-cc-bindings-osx

On OS X at build time compile the CC bindings (+ style fixes for dh/dsa OpenSSL bindings)
expand tox backend example
Merge pull request #468 from reaperhulk/backend-flag-pytest

Add backend flag for pytest runs
Merge branch 'master' into commoncrypto-cipher-backend

* master:
  expand tox backend example
  On OS X at build time compile the CC bindings
  fix docs
  update docs for name attribute
  revert fixture decorator for now, switch to append. no more globals
  docs for explicit backend selection and document name attribute of backend
  modify backend selection to allow multiple backends via comma delimiter
  better name for the variable
  don't mutate _ALL_BACKENDS
  pass posargs via tox so --backend can be used for tox envs
  support --backend as a pytest flag to limit to one backend for testing