Runner should execute a built Scenario
Allow writing scenarios to tempfiles

This will be used later in runner instead of compiling to a permanent location.
Execute scenarios using tempfiles rather than permanent locations on disk
Sensible testing of Tempfile removal where it can be guaranteed

Conflicts:
	spec/sippy_cup/scenario_spec.rb
Add a ducktype of Scenario for running SIPp scenarios directly
Get all options to modify the SIPp command executed from the Scenario
Add docs for Scenario#compile! return value
Consistency of trailing periods in documentation
Use a default scenario name if none is supplied in the manifest
Scenario name should be implied from manifest filename where possible
Cleanup specs
Allow referencing a SIPp scenario (and media) from a YAML manifest rather than providing steps
Typo
Changelog entry
Merge branch 'master' into feature/concern_separation

Conflicts:
	lib/sippy_cup/tasks.rb
Merge pull request #36 from mojolingo/feature/concern_separation

Fully separate concerns between Scenario and Runner