VERSION BUMP: 0.3.9

## Included
* Added `example/` directory to be able to test alertify.js during development without copying files to other directories
* Updated grunt to 0.4. Running `npm install` from the root alertify.js directory will install all required dependencies to be able to build/test/lint alertify.js

## Fixes
* resolve button reverse focus issue #91 
* resolve hang on older iOS #133