Improved the tasks API
Refactored the Schematica DB API and started an implementation for JDBC databases
Renamed the package in the 'schematica-json' module to use 'impl' so that it does not share the same package as the 'schematica-json-api' module. Not sure if this is required, but in cases where both are on the classpath, we do want to distinguish between what's in each package.
Made use of Java 7's AutoCloseable resources
Corrected provider classname
Added JavaDoc and made Path a bit easier to use.
Added more JavaDoc and refined the Schematica DB API and implementation
Added two transaction managers for testing purposes