New: Changes for Release 1.2.6

Refer to VERSION_HISTORY.md for more details.
New: Add new "badges" to the README file

These new badges show the most recent version number and the license.
Fixed: Omit __init__ files and analyzer templates from coverage reports

These were previously lowering our coverage percentage for no reason.
Revise TemplateExperimenter for VIS 2

Actually... for VIS 1 too... this was pretty outdated!
New: RBarChart in an experimenter

It's not yet used by the WorkflowManager, but at least it exists!

Closes #283
Merge branch 'master' into devel_2

Conflicts:
	VERSION_HISTORY.md
	vis/__init__.py