Patch to build in OS X 10.9

Tested in OS X 10.9.2 & clang-500.2.79
Not yet 100% in mrpt-hwdrivers
Merge pull request #19 from yuya-oc/osx-build

Patch to build in OS X 10.9
Fixed logical OR typo.
Fixed C++11 GCC warnings
debian/watch: Update to point to GitHub