clean JsonParser's code
parser: Improve heading parser
tests: Add StructuredText's blocks tests
tests: Remove empty useless tests skeletton
Handle ‘preformatted’ StructuredText blocks
Replace all old “wroom.io” by “prismic.io”
API.get now raise exception when receiving error
Remove forgotten debug
Cleaning use of access_token
SearchForm now have link to API and use access_token
Clean refs labels

Refs' keys are downcase and Ref.ref are untouched.
Save Ref.scheduled_at
Add OAuth helpers
Bump to 1.0.0.preview.2