Change css modules to BEM for easier overriding

• Merge branch 'fix_for_issue_159' c2b6a41
• Fix code review issues d63cb60
• Change css modules to BEM and update example application 35e3dc5
• Merge pull request #162 from sandstreamdev/all-contributors/add-davidreact 27445bf
• docs: update .all-contributorsrc [skip ci] 7df4d22
• docs: update README.md [skip ci] db2b86b
• Merge pull request #161 from sandstreamdev/update_dependencies_and_fix_formatting d6576f7
• Update postcss plugin configuration 5d6a459
• Update dependencies and fix formatting 719f497
• Merge branch 'update_readme_and_example_run_scripts' 0ba7ddd
• Remove grenkeeper from readme and update example scripts names for codesandbox 22bed43
• Merge branch 'update_example_app_dependencies' 6c0063d
• Update example app dependencies 80edd95

v0.5.0...v0.6.0