Update GettingStarted.markdown
First pass at MariaDB support.

test/tabletmanager.py passes!
It's enabled by setting MYSQL_FLAVOR=MariaDB before anything.
Merge branch 'master' into replication
Simplify queryservice tests.
Fixes to the queryservice test.
Fixing bootstrap.sh to create the hook link.
Merge branch 'master' of github.com:youtube/vitess
Merge branch 'master' into monitoring
Merge branch 'master' into monitoring