Fixes #5962
remove unused execution getBodyText() because already executed in assertion
swap to remove else
add test in ZendTest\Mail for MimeMessage and remove dependencies of ZendTest\MessageTest use statement
Merge branch 'hotfix/#5962-mime-empty-string-on-no-part'

Close #5962
Close #6157
Hotfix for UnderscoreNamingStrategy for 2.3, will be fixed properly in 2.4
#6207 - removing unused `@group` annotation
Merge branch 'hotfix/#6207-underscore-naming-strategy-not-studlycase'

Close #6207
Fixes typo algorihtm -> algorithm
Merge branch 'typo/#6213-typo-fix'

Close #6213
Console Adapter typo
Merge branch 'typo/#6215-console-adapter-typo'

Close #6215
Fixes typo : contructor -> constructor
Merge branch 'typo/#6217-callback-paginator-test-typos'

Close #6217
#6218 - applying hotfix for `iconv.internal_encoding` deprecation

See https://wiki.php.net/rfc/default_encoding

 > PHP 5.6 and master, introduce new php.ini setting. Old iconv.*/mbstring.* php.ini parameters will be removed for master PHP6. Use of iconv.*/mbstring.* php.ini parameters raise E_DEPRECATED for 5.6 and up.
Fixes typos
Merge pull request #6219 from Ocramius/hotfix/#6218-iconv-internal-encoding-deprecated-in-php-5.6

#6218 - applying hotfix for `iconv.internal_encoding` deprecation
Merge branch 'hotfix/6219'

Close #6219
Merge pull request #6237
Merge pull request #6237 in master