max overflow

Enabled the passing of max_overflow to create_engine
Fix ZeroDivisionError when counting Pagination object pages

When ``per_page`` was set to ``0``, there was ZeroDivisionError
raised in ``Pagination.pages`` property.
sqlalchemy events integration to remove deprecated extensions
Merge pull request #122 from ignacysokolowski/master

Fix ZeroDivisionError when counting Pagination object pages
Export sqlalchemy event module on the extension
Merge branch 'master' of github.com:mitsuhiko/flask-sqlalchemy
Merge remote-tracking branch 'thrisp/sqlalchemy_events_revision'
Merge pull request #119 from scragg0x/patch-1

max overflow
Added missing documentation for new functionality
0.16 -> 0.17
Merge with original repository