Add paragrpah on how to do an include using pyramid.includes in .ini
Add "Why use Redis for your sessions" and "Why not use Redis for your sessions"
to index.rst
Add "Why not use Redis for your sessions" to README.rst
Remove "Why Redis?" from redis.rst
add some example of why someone might want to supplying their own Redis client
in advanced.rst
Merge pull request #27 from goodwillcoding/updates.refactoring

Update docs with use of "pyramid.includes" in .ini, Added Why and Why not use Redis sections and some examples for why one want to supply a custom redis client