Merge branch 'hotfix/typo' into develop

* hotfix/typo:
  * format
+ titlecase(item titles)
* Title_Undescore_Citation_Key
* refactoring
+ abbr rules
Merge branch 'release/rel-0.3.0'

* release/rel-0.3.0:
  + abbr rules
  * refactoring
  * Title_Undescore_Citation_Key
  + titlecase(item titles)