Documentation Updates

DOC: Cleaning up README.md

Update badges for README.md

Update version to v0.4.0

Version 0.3.0

Merge branch 'issue04_var_expansion' into 'master'

Issue 04 - Handling Variable Expansion

Closes #4

See merge request trilinos-devops-consolidation/code/SetProgramOptions!5

Version 0.1.0 release