added avatar field for uploaded image and set default value for gravatar (email)
profile edit form now shows gravatar and file upload field
Avatar files are being uploaded, default data dir is app/data/avatars
Uploaded file now is being validated as Image
Merge branch 'master' into avatar-upload
Merge branch 'master' into avatar-upload
Added the upload_avatars parameter to parameters.yml-dist
Implemented image wrapper method
Merge pull request #110 from erikaheidi/avatar-upload

[avatar-upload] Base for the new avatar feature