Document static groups of dynamic groups

Document how to create static groups with dynamic child groups
Teach env-setup how to create egg-info for ansible so that pkg_resources works
Restore the pkg_resources calls so that we pull in the correct pycrypto on RHEL6
Remove unused if/else clause, since it doesn't change anything
Fixing version added for the fire/forget check later feature
Default 'smart' connection to paramiko for OSX platforms

Due to the long-standing bug in sshpass, which can crash OSX.

Fixes #5007
Add submodules for new core and extras subdirectories of modules, not yet live.
Modules is a package.
Update module test code to avoid pycs (that are not used)
changes for package loading of modules
Updating the module formatter to deal with the new repo structure.
Some various comments about the new repos, more to likely come.
README update
hacking/env-setup no longer needs to set library since modules appear as git submodules.
Removing legacy test dir
Docsite formatting
Add a new inventory parameter (ansible_sudo_exe) to specify sudo command path.
Updated installation instructions for submodules

Added `--init --recursive` to installation instructions
as per @bcoca's suggestion on ansible-project mailing list
Update README.md
Doc fix in intro_installation.rst

Missing code block