Add buster.js as a development dependency.
Add buster.js as a development dependency.

 * Added buster.js to 'devDependencies' so that it's properly installed
   with 'npm install'.
 * Added a 'scripts' key with the 'test' sub-key which allows Hydra to
   be tested simply by running 'npm test'.

mlev/robohydra,mlev/robohydra,robohydra/robohydra,robohydra/robohydra,mlev/robohydra