DNET-579
DNET-573
Proper GetHashCode.
Removed stupid comments.
New constants.
First try on new Shutdown/Online.
Merge pull request #20 from cincuranet/dnet-226

DNET-226
DNET-552
Merge pull request #21 from cincuranet/DNET-552

DNET-552
Added FbMigrationSqlGenerator.
Implemented RenameTableOperation.
Renaming procedure.
Renaming index.
Setting default FbMigrationSqlGenerator.
Some not supports.
Drop index.
Drop procedure.
Drop table.
Rename column.
Dropping PK.