Version Bump
Added aggregate methods (min/max/avg/sum)

Closes #77
Bug fix in the rails reloader code

Closes #78
with_index can take no argument
Add a connection lock

Fixes #80
Save the real_type until we have complex types support

Closes #81
typo
order_by() can take strings
with_index() can influence order_by()

Also, order_by() can use the same index of the where clause when they are the
same and where() is using a r.between() clause.

Closes #82