Merge pull request #277 from davipt/master

make jar with right folder structure
Imported Visual Studio solution into Visual Studio 2012. Copied config.hpp into src/main/c++/.
Merge pull request #281 from mrt181/master

Imported Visual Studio solution into Visual Studio 2012.
Fix issue #283 - Add libsodium to travis-ci build
Merge pull request #284 from trevorbernard/master

Fix issue #283 - Add libsodium to travis-ci build