[DS-831] Recent items addon : Listing of most recently added items to DSpace

This pull request is modified version of the patch made by Joao in DS-831. 

I made the following changes.

1) remake patches for version 3.1
2) change property names from "recentsubmission.*" to "recent.submission.*"
3) change default value of "recent.submission.hideCommunities" from true to false
4) set default value to "recent.submissions.sort-option" and "recent.submissions.count"
5) use resultItems directly