Ensure db and db users created before validation

Ensure that for PostgreSQL backends, the database validation functions
are not run until the initial database creation and user role creation
has been completed.

Closes-Bug: #1298605
Allow more flexible routes configuration
implement max_threads option for jetty
remove default assumption in README
Merge pull request #125 from rickerc/bugs/1298605

Ensure db and db users created before validation
Merge pull request #130 from stefanandres/jetty_max_threads

implement max_threads option for jetty
Merge pull request #127 from dalen/flexible_routes

Allow more flexible routes configuration
Allow to set the manage_server parameter in the init class
Fixed typo
Merge pull request #131 from digitalmediacenter/allow_manage_server_init

Allow set manage_server in init class