Implement support for additional trust anchors on OSX.
Adopted code from `test_root_certs_mac.cc` to modify anchor certificates in `SecTrustRef` using `SecTrustSetAnchorCertificates`.
Required for rogerwang/node-webkit#2561
Implement support for additional trust anchors on Windows.
There seems to be no way to pass these through the Windows API, so we check the list manually when validation returns an untrusted root and skip the policy checks if a custom root is found.
Required for rogerwang/node-webkit#2561
Merge pull request #24 from fancycode/additional_trust_anchors_osx

Implement support for additional trust anchors on OSX.
Merge pull request #25 from fancycode/additional_trust_anchors_win

Implement support for additional trust anchors on Windows.
support only 100 percent resources for now
Don't always try to use native frame

Part of fix for rogerwang/node-webkit#1021
Merge commit '88f9bd0af2a166977c1f0e075d82889e1ba2f72d' into development11