README.md: Drop 'unofficial' from heading

Some of these tools are now supported, so drop the 'unofficial' label from
the top-level README file.
Capitalize "OpenShift" and "ActiveMQ" correctly

Fix the capitalisation of "OpenShift" and "ActiveMQ" in a few files.
Merge pull request #322 from Miciah/enterprise-2.1-drop-unofficial-and-fix-capitalisation

Drop "unofficial" from README and and fix capitalisation of "OpenShift" and "ActiveMQ"