Add SpineItem.title in Java layer
Added dual license (Affero GPL)  to all the source files.
Added dual license (Affero GPL)  to all the source files.
Updated all the licenses to GPL Affero
Add mediaType field in SpineItem.java to pass the value to readium-shared-js
Workaround for SFINAE issues on MSVC compiler around `ePub3::async()`.

You'll notice, if you look at the implementation of `std::async()` on Windows 8, that MS doesn't have the non-policy version of the function (or something along those lines-- I don't have a copy here right now). Guess why? ;o)

This commit hides the non-policy version when compiling using MSVC. If you attempt to use it, you should be able to interpret the error code correctly. I went through a whole heck of a lot of template and type fudging to try and find a way to make MSVC actually correctly interpret the parameters, but in the end I couldn't: if a policy is the first argument, MSVC matches the non-policy template; with no policy, it matches the policy template. Le sigh.

Ironic, really, when the whole custom (well, based on Boost) implementation of `<future>` here is specifically to provide support for *Microsoft's* `future::then()` proposal.
Fighting line endings
Fighting line endings
Fighting line endings
Fighting line endings
Merge branch 'release/0.14' into develop