Release 0.5.8

• ability to run entirely with a specified data models URL
• improved subcommand integration and usage message
• deterministically ordered constraint and index DDL
• removal of auto-module-generation behavior
• improved deployment to docker hub with branch-named tags (with master as latest)
• DDL output saved as build artifacts in CircleCI
• Oracle specific DDL improvements
  • create table if not exists functionality
  • proper commits after each insert
  • scripts to toggle logging and nologging behavior on objects
• SQLite specific DDL improvements
  • remove alter table add constraint statements