feat(examples): move examples to iframe

- generates a file on disk per each example found, includes it in the docs via an iframe
- configure common example dependencies
- make sure example names are unique (based on filename, doc id and sequence number
- make @example and <doc:example> both handle params (module, deps, height) in a consistent way
- allow configuration of common example dependencies

this is still a WIP...

@todo configure a basePath for relative urls
@todo handle dependencies with relative urls when creating a Plunkr
@todo jsfiffle?
chore(deps): bump angular