Fixes to variable issues introduced by recent changes

Fixes #6801
Fixes #6832
Add version_compare filter
Update README.md

Add counter
Update README.md

formatting
Fix a typo in the subversion module documentation
Merge pull request #6841 from bearstech/subversion_fix_typo

Fix a typo in the subversion module documentation
Merge pull request #6787 from tyll/pull_ssh_prompt

ssh: propagate prompt to _communicate()
Merge pull request #6711 from j2sol/raw-unreachable

Treat 255 errors from raw as dark host
Fixes #6088 turn off sudo and su if the connection is local the sudo user matches the current user
Fixes #6454 verify ec2 key fingerprints
Fixes #6750 Check git subcommand for --remote and expose errors
fixed error related to type being defined as a number
Addresses #6750 Use --help instead of -
ec2: added ability to set EBS optimized instances

added version
Allow isprintable() util function to work with unicode

Fixes #6842
Add support for shared module documentation fragments
Use PluginLoader for module docs fragments
Use common file argument system previously implemented by @sivel for rax modules on the file modules as well (copy/file/template).
Application to other cloud providers would make very good sense.
Merge pull request #5555 from sivel/expose-playbook-to-callback

Expose the playbook to callback plugins
Merge pull request #6603 from sivel/rax-inventory-improvements

rax.py inventory script improvements