Fix incorrect spec.
Fix incorrect spec.
Match mock storage start/stop API to real storage behavior.
Complete spec for authorization_request:fetch/1
Fix specs for oauth1_parameters:validate_presence/(2, 3)
Exclude meck from paths to dialyze.
Switch to dialyzing sources instead of bytecode.
Define credentials:t/1 using it's runtime representation.

So that Dialyzer can track which case of credentials_type/0 it was initialized
with.