"getWhereConditions" in the postgres "QueryGenerator"
can now prepend table names to attributes. This fixes
issue #629.
Fixed two syntax errors in postgres QueryGenerator (removed 2 unneeded commas).
Updated postgres query-generator jasmine spec to
make changes in issue #629 pass.
Merge pull request #630 from Obbedire/master

Issue #629: Attribute ambiguity issue when eagerly loading.