Merge branch 'release/0.1.0' into develop
Make local MySQL installation conditional

For WordPress installations that depend on an externally hosted MySQL
endpoint, the `wordpress_site_env` attribute can be used to determine if
MySQL should be installed and setup. If the attribute is set to anything
other than `development`, the the local MySQL installation will be
skipped.
0.1.1
Merge branch 'release/0.1.1'