to_sql method should accept database URI as con parameter
Hello,

This enhancement is quite similar to https://github.com/pydata/pandas/issues/10654

`to_sql` method should accept database URI as con parameter

So we could do

```
import pandas as pd
db_uri = 'dialect+driver://username:password@host:port/database'
query = 'SELECT * FROM table'
df.to_sql("table", db_uri)
```

instead of :

```
import pandas as pd
from sqlalchemy import create_engine
db_uri = 'dialect+driver://username:password@host:port/database'
engine = create_engine(db_uri)
df.to_sql("table", engine)
```

Might apply to :
- Series http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.to_sql.html
- Panel http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Panel.to_sql.html
- and DataFrame http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.to_sql.html

Blaze uses table URI like `'dialect+driver://username:password@host:port/database::table'`
so passing table as parameter is not necessary, as it is contained inside (table) URI
but It may be difficult to mimic this API without breaking eggs (`con` should be first parameter and `table` should be second with a default `None` value)

Kind regards
