First pass at using omnibus
Remove files that are not used anymore
Add a UI to the Windows installer

We'll be able to control whether the app starts up or not after
installation.
Switch license file to rtf and to the right license
Merge tag '4.1.0' into windows-installer-ui

4.1.0
Update license reference
Merge with master
Properly check if jmxfetch is already running
Use pg8000 instead of psycopg2

See #877
Merge with branch to use pure python dependencies for db checks
Bump version to 5.0.0
Use pymysql instead of MySQLdv

See #877
Use pymysql instead of MySQLdv

See #877
Create a test for postgresql check
Merge branch 'master' into pure-python-db-checks
Merge with pure-python-db-checks
Fix mysql and postgresql tests
Merge branch 'pure-python-db-checks' into omnibus_bundling
Fix postgresql test
Merge branch 'pure-python-db-checks' into omnibus_bundling