Image uploads

- add carrierwave
- config to use S3 on production and staging
- delegate image processing to bacground jobs
- changes to remote-form to work with multipart
- uploader components (based on jquery-fileupload)
- **simple js transalations**, works like below:
 
```
on /config/locale/en/js.yml
    en:
      js:
          some_namespace:
            some_string: 'Translated here'


on any js file:
    I18n.some_namespace.some_string #=> 'Translated here'
```

- remove reference of konacha:run from readme (since its very unstable.. better just use 'serve')
- specs  
- User edit form working with avatar uploader