Awsscripter

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* Improving stack dependency resolution.
* Improving CLI output for validate template command.
* Consolidating pip requirements files.
* Fixing Python 3 support.
* Fixing documentation typos.

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* Removing sceptre diff command.
* Adding support for the stack notifications attribute in stack config.
* Fixing bug which caused session re-creation on every boto call.

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* Re-adding the ability to specify credential profile in the environment config.
* Adding init project command to help initialize a new Sceptre project.
* Adding init env command to help initialize a new Environment config.
* Adding diff command to display differences between the local and deployed stack template.
* Fixed error message displayed for empty environments.
* Adding ``environment_config`` to config template rendering.
* Adding ``on_failure`` parameter to stack config.
* Adding automatic renewal of expired credentials when assuming IAM Roles.
* Deprecating use of ``bash`` hook in favour of ``cmd`` hook.
* Deprecating use of ``asg_scheduled_actions`` hook in favour of ``asg_scaling_processes`` hook.
* Adding status colouring for output of describe-env command.
* Fix spelling mistakes in documentation.

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* Changing Jinja rendering for templates only with '.j2' extension.
* Fixing broken links in documentation website.
* Updating references to Python templates instead of Troposphere templates.

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* Increasing maximum number of boto call retires from 5 to 30.
* Adding support Jinja rendering for stack templates.
* Adding stricter requirements for existing stack state when launch environments.
* Adding ``cmd`` hook for better cross platform support.
* Adding documentation around architecture of Sceptre projects.
* Adding versioned documentation.
* Improving documentation formatting.
* Fixing path error bug when using environment level commands on Windows.
* Fixing bug to correctly throw an AtrributeError in a Python stack template.

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* Fixing bug for ``protect`` in stack config.