Update SQLAlchemy to 1.2.7
Update SQLAlchemy to 1.2.7

http://docs.sqlalchemy.org/en/latest/changelog/changelog_12.html#change-1.2.7
dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq