Add svg assets for Aol.
Add svg assets for "Microsoft Account"

I'm not sure about the transparency here... it definitely violates the
simplicity of the rest of the icon set (not to mention Microsoft's brand
guidelines). But I couldn't think of any other way to make this actually
work in monochrome.

There is a "Windows" logo that works in monochrome (the window in
isometric perspective), but that is specific to Windows and Windows
Phone, not the Microsoft Account, which is what I needed it for.
Add svg assets for "Netlog"

Does Netlog exist any more? I can't tell if its all part of Twoo now or
what. But I need an icon for it nevertheless.
Add svg assets for VK

Addresses issue #156.

I would _love_ if someone better at tracing vector graphics than I would
go over some of these paths and fix them. This works well enough at the
sizes I'm using it at, but its going to be really awkward at the
1024/1048 pixel sizes.
Add svg assets for VZ Netzwerke

Maybe this could be switched out for the star logo? The lettermark is
what is used more often though, so I just picked that.
Add svg assets for Paypal
Add svg assets for Salesforce
Add svg assets for VeriSign
Merge pull request #162 from thanj/dev

New svg icons