Prefer executable code examples
Renamed bindings to backends
Also rename teh tests
Need to include the imports
Merge pull request #307 from alex/prefer-doctest

Prefer executable code examples
Test that docs compile under latex as well --needed for PDF building
Merge pull request #309 from alex/test-latex

Test that docs compile under latex as well --needed for PDF building
Merge pull request #308 from alex/rename-bindings

Renamed bindings to backends
Merge branch 'master' into fernet
Update import location