Merge pull request #3 from julianlam/master

adding a logic check to ensure the Mandrill object is instantiated befor...
Update package.json
Merge pull request #4 from julianlam/master

0.5.0 compatibility
0.1.2
Update index.js
0.1.3
Update plugin.json
cleanups
more cleanups
compatibility
0.1.4
0.6.0 compatibility
0.2.0