Update mysql56-install.sql

small change, but need to use the db before you create tables in it.
Update mysql56-save_history.sql

use db foo - tries to connect to "db", not "foo".
Update mysql56-save_history.sql

EXECUTE needs to use stmt, not @stmt.
Merge pull request #95 from Sheeri/master

Small tweaks to make these files actually work.

+ fixed USE statements
+ fixed EXECUTE