Fixed Uint() method actually storing a signed int.
Fixed Uint() method actually storing a signed int.

Also fixed two constructors missing explicit.

Change-Id: I147b2d2517bb660d92d4b0167992c115ed65dca7

alexames/flatbuffers,royalharsh/flatbuffers,google/flatbuffers,stewartmiles/flatbuffers,rw/flatbuffers,royalharsh/flatbuffers,stewartmiles/flatbuffers,hgl888/flatbuffers,stewartmiles/flatbuffers,google/flatbuffers,stewartmiles/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,stewartmiles/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,stewartmiles/flatbuffers,DavadDi/flatbuffers,DavadDi/flatbuffers,evolutional/flatbuffers,pjulien/flatbuffers,google/flatbuffers,pjulien/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,hgl888/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,google/flatbuffers,rw/flatbuffers,alexames/flatbuffers,pjulien/flatbuffers,hgl888/flatbuffers,stewartmiles/flatbuffers,alexames/flatbuffers,DavadDi/flatbuffers,stewartmiles/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,google/flatbuffers,stewartmiles/flatbuffers,google/flatbuffers,google/flatbuffers,DavadDi/flatbuffers,google/flatbuffers,pjulien/flatbuffers,evolutional/flatbuffers,google/flatbuffers,evolutional/flatbuffers,royalharsh/flatbuffers,alexames/flatbuffers,hgl888/flatbuffers,rw/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,rw/flatbuffers,evolutional/flatbuffers,hgl888/flatbuffers,stewartmiles/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,royalharsh/flatbuffers,google/flatbuffers,stewartmiles/flatbuffers,royalharsh/flatbuffers,alexames/flatbuffers,royalharsh/flatbuffers,google/flatbuffers,DavadDi/flatbuffers,google/flatbuffers,evolutional/flatbuffers,pjulien/flatbuffers,royalharsh/flatbuffers,google/flatbuffers,hgl888/flatbuffers,rw/flatbuffers,royalharsh/flatbuffers,rw/flatbuffers,rw/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,google/flatbuffers,google/flatbuffers,rw/flatbuffers,alexames/flatbuffers,rw/flatbuffers,pjulien/flatbuffers,royalharsh/flatbuffers,royalharsh/flatbuffers,rw/flatbuffers,DavadDi/flatbuffers,rw/flatbuffers,pjulien/flatbuffers,pjulien/flatbuffers,rw/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers