QSqlMigrator Versions Save

Fixed crash for removed migrations.

Over a year after the 1.0, we are proud to release the next version. With over 100 commits, some code and api cleanups.

We now follow semantic versioning schema.

Some highlights:

• many cleanups
• more compiler support (see readme)
• support for new Qt versions
• postgresql database support

Features:

• builtin support for tables, columns and indices
• you can build custom commands
• easy api
• everything is tested
• database specific driver plugins (sqlite and mysql provided)