Update URL for pymssql
Update pymssql dialect description, remove "limitations" section
dialects/mssql/pymssql.py: Remove second two paragraphs, as requested by @zzzeek.
- cx_oracle test for "unicode returns" needs to be cx_oracle only,
and also will fail on py3k.
- enhance exclusions so that a requirement attribute can be passed
to fails_if/skip_if.
- fix coverage docs to mention pytest.
merge from oracle dialect
import testing needs to be here as we set .db on it
put fails for these various things that don't work on pypy, not sure what approach
should be taken
Merge pull request #75 from msabramo/pymssql_update_web_site

Update URL for pymssql
take out the support paragraph and just put a basic intro
Merge https://github.com/zzzeek/sqlalchemy
has_table() and has_sequence() don't use subquery.