Add mybatis dependency; add mybatis-cfg; DatabaseService: delete old methods (stubs instead), add new methods (stubs), rename methods
Remove hibernate; create mappers, user mapper can get id; some other changes
Add script with new database schema, apply it to configs (rename tables/columns)
Remove hibernate mappers; signin (database part) works
Change xml mappers to annotations; some clean in DatabaseService; signin via annotations works
Merge remote-tracking branch 'remotes/origin/from-hibernate-to-mybatis'

Conflicts:
	update-notifier-backend/.classpath
	update-notifier-backend/src/main/java/hibernate.cfg.xml
	update-notifier-backend/src/main/java/net/thumbtack/updateNotifierBackend/databaseService/DatabaseService.java
	update-notifier-backend/src/main/java/net/thumbtack/updateNotifierBackend/resourceHandlers/UsersHandler.java
	update-notifier-backend/src/main/java/net/thumbtack/updateNotifierBackend/updateChecker/CheckUpdatesTimerTask.java
Some renames.