Refactored Models/Git-Author constructors with parameter properties
Refactored Models/Git-Author constructors with parameter properties

Used parameter properties to reduce redundancy.

kactus-io/kactus,kactus-io/kactus,artivilla/desktop,say25/desktop,shiftkey/desktop,shiftkey/desktop,j-f1/forked-desktop,desktop/desktop,say25/desktop,shiftkey/desktop,j-f1/forked-desktop,artivilla/desktop,artivilla/desktop,say25/desktop,artivilla/desktop,shiftkey/desktop,j-f1/forked-desktop,kactus-io/kactus,desktop/desktop,say25/desktop,kactus-io/kactus,desktop/desktop,desktop/desktop,j-f1/forked-desktop