Add the CreateCQLMigration func.
Add the CreateCQLMigration func.

This function will create a new migration file using the nomenclature:

	$CQLMM_MIGRATIONS_DIR/migrations/$UNIXTIME_$NAME.cql

This function is in the github.com/nesv/cqlmm package, and will be
imported by the github.com/nesv/cqlmm/cmd/cqlmm command.

nesv/cqlmm