Add Scalrpy 2 (Scalr 5.1) support

Installation procedures, calling conventions, as well as arguments have
changed.
Launch rrdcached with settings Scalrpy recognizes

The Scalrpy plotter starts rrdcached on its own if it doesn't find
it running. So that we don't end up with two rrdached processes, we
configure rrdcached so that it plays nice with what Scalrpy expects.
Release: 6.5.0
Merge pull request #66 from Scalr/release-6.5.0

Release 6.5.0
Trap more signals in the release script
Separate the app and MySQL components in cookbook
Support separate components in install script
Ignore Scalr version when creating Analytics DB
New implementation of the scalr installer

The Scalr installer is now a CLI application, instead of being a
single script.
Add a Docker-based Debian packaging environment
Support SSH directory sharing despite UID mismatch

This enables us to use the user's ~/.ssh/config despite it not having
the right UID, etc.
Add a document target

The document target returns the current configuration for this install
Also publish package to PyPi
Add a stub RPM builder
Integrate wrapper and release infra
Replace legacy wrapper with new wrapper