Set default charset to UTF-8 for StringEntity and UrlEncodedFormEntity.
Merge branch 'entity_default_charset' of https://github.com/synhaptein/manticore into synhaptein-entity_default_charset
Determine the minimum encoding necessary for body and params entities, rather than always using UTF-8. Add unit tests for the functionality.
Merge branch 'synhaptein-entity_default_charset'