Fix plenty of security issues

Security: XSA-117 / CVE-2015-0268
Security: XSA-118 / CVE-2015-1563
Security: XSA-121 / CVE-2015-2044
Security: XSA-122 / CVE-2015-2045
Security: XSA-123 / CVE-2015-2151
Security: XSA-125 / CVE-2015-2752
Security: XSA-127 / CVE-2015-2751
Security: XSA-132 / CVE-2015-3340
Security: XSA-134 / CVE-2015-4163
Security: XSA-136 / CVE-2015-4164