Upload CI disassembilies to Pastebin/Gist

[mattico]

The disassembly makes the CI logs really long, which makes the page load slowly, and could obscure errors which happen after them. This problem is only going to get worse as the library gets bigger. Uploading the disassembly to makes it fairly easy to have a disassembly available for every build, but makes the logs more manageable.

[japaric]

👍 On Linux, at least, we can use something like the wgetpaste command.

[japaric]

Linux and Windows are now using gist. OSX is not using gist yet.