Fix DataAccess test on HHVM

Add travis build matrix for all built-in PostgreSQL versions

Exclude HHVM + PostgreSQL and HHVM + Mysqli from travis build matrix

Add dependency badge to the README

Add missing type parameters to connection fetch methods

Fix SQL Server drivers and functional test suites

Fix statement for getTableWhereClause method

If you have a role "postgres" in PostgreSQL that is described like this:
```
-- Role: postgres
CREATE ROLE postgres LOGIN
  ENCRYPTED PASSWORD 'md53175bce1d3201d16594cebf9d7eb3f9d'
  SUPERUSER INHERIT CREATEDB CREATEROLE REPLICATION;
ALTER ROLE postgres IN DATABASE sf_test
  SET search_path = "$user", public, access, geographic, rrhh;
```

At the time when I execute the statement (Part of $schema value in the line 348):
```
SELECT string_to_array((select replace(replace(setting,"$user",user),' ','') from pg_catalog.pg_settings where name = 'search_path'),',')
```
I fetch this result:
```
{public," access"," geographic"," rrhh"}
```
Look the space character that is on the start of each string.This error does not match any namespace to which the role has access. This is critical when you have PostgreSQL database and you work with schemas.

Fix integer type mapping in SQL Anywhere 16

Fix driver error while introspecting sequences in SQL Server 2012

Don't return warnings as errors in sqlsrv driver

This reverts commit 5a46f577.