[STORAGE] added postgresql support
Merge branch 'release-1.10' into postgresql
[STORAGE] added back postgresql module inclusion
[STORAGE] override _query() method in order to correctly retrieve last insert id
[QUERYBUILDER] added postgresql support
[TESTS] added postgresql tests
[STORAGE] patch QueryBuilder.escape in order to have a valid escape for postgresql
[TESTS] adjust travis.yml to perform postgresql tests