Merge pull request #1 from dmi3yy/master

from my to you
Merge pull request #2 from dmi3yy/master

From dmi3yy
+ The Ditto extender “Customsort” has been added.
* Ditto.customsort extender: Just minor code style changes.
* Ditto.summary extender: All the calls of “strpos” were replaced with “mb_strpos” ones.
* Ditto.summary extender: The problem with text ending in a fragmented word was solved.
Merge pull request #170 from DivanDesign/master

Changes in Ditto summary & customsort extenders