Unity.osxfixes

Merge of two pull requests that were outstanding on the Peercoin main repo:

 * [#24 - Corrected a few Mac OS/X 10.9 build issues](https://github.com/ppcoin/ppcoin/pull/24)
 * [#52 - fix Mac OS X dock minimizing](https://github.com/ppcoin/ppcoin/pull/52)

In the first pull request's case, Samilaine's fork and branch were no longer accessible, so a direct inclusion was not possible. For Curve25519's fix for issues while minimizing the client, it was possible to pull the branch in directly and add it to the commit.