Add support for MSSQL when creating/dropping db

[jomasti]

No description provided.

[jomasti]

I tested this locally using a SQL Server instance in Docker. I guess the same would need to be done in Travis to support running tests against SQL Server. Or maybe setting up AppVeyor and only running SQL Server tests there.

[deterralba]

I wanted to ask if we the support for sql server would be welcome for the create/drop operation, I am glad to see it's an ongoing work!

The value of engine.url.database is None when we use exact pyobdc strings (see http://docs.sqlalchemy.org/en/latest/dialects/mssql.html#pass-through-exact-pyodbc-string), hence the database creation fails.
Should this be patched here or should I create an issue the sqlalchemy repo?

[kvesteri]

Thanks for the PR. In order for this to get merged the travis CI must be configured to support MSSQL as well.

[jomasti]

@kvesteri Travis is set up with SQL Server now.

[kvesteri]

Thanks for the PR! 🚋