Adding some filters to generic fdw.
Expression class now correctly handles composite expressions.
Some expects got uncommented.
Fixed #157. Query data is sent to clients
Merge pull request #8 from szilardhuber/master

Finished testing of Expression class
Merge pull request #9 from szilardhuber/feature-148

Feature 148 - Added filters to generic FDW
Merge pull request #10 from szilardhuber/feature-157

Fixed #157. Query data is sent to clients
use gtest from virtdb-gtest
use gtest from virtdb-gtest as a submodule
Merge pull request #11 from dbeck/master

use gtest as a submodule from virtdb-gtest