read stream features after starttls or compresion
Merge pull request #40 from esl/fix-stream-features-for-stattls

read stream features after starttls or compresion
Remove unused and unexported function
Fix record construction sites in escalus_stanza
Fix escalus_pred:has_carbon/5 spec
Fix escalus_connection:get_stanza/2 spec
Spec and document get_user_option/5, get_defined_option/4
Define escalus:client() type
Spec some stuff in escalus_users
Almost done with speccing escalus_users