Updated 'make docs' to latest ex_doc cli args
Merge pull request #1886 from jwarwick/make_docs

Updated 'make docs' to latest ex_doc cli args
Make inspect in general 20% faster

There are two main optimizations:

1. We have optimized Module.concat/2 (it is roughly 100% faster)
2. We have optimized rendering of Inspect.Algebra by skipping
   the intermediate s_doc representation. This reduces memory
   allocation and skips one extra pass on rendering.
Update typespecs in Inspect.Algebra
Add Enum.reverse/2