[#90][WIP] changed method from approve_keyword to disapprove_keyword
[#90][WIP] updated test to be for disapproval
[#90][WIP] updated documentation for disapproval
[#90][finished] updated UML for disapproval
[#90][MC] solved merge conflicts with master
[#90][WIP] updated documentation
[#90][WIP] updated documentation
[#90][finished] documentation
Merge pull request #341 from MGhanem/C2_Mirna-Yacout_C4F4_recordApprovalOfAKeyword

C2 mirna yacout c4 f4 record approval of a keyword