docs(version control): Move under developer grouping.
docs(testing): Add and link testing placeholder.
docs(testing): Mention of unit and integration testing.
feat(tests): Add semantic version compliance test.

Validate that installed package version number complies with semantic
versioning, the project's chosen versioning scheme.
feat(tests): Satisfy semantic versioning test.
feat(tests): Add travis configuration
feat(tests): Add travis build state tag
Merge branch 'travis-integration'