Add -Wall -Werror in travis-ci
Add -Wall -Werror in travis-ci

Closed #106

dimotsai/libchewing,robert501128/libchewing,PingNote/libchewing,dimotsai/libchewing,Chocobo1/libchewing,robert501128/libchewing,Chocobo1/libchewing,cwlin/libchewing,Chocobo1/libchewing,kito-cheng/libchewing,PeterDaveHello/libchewing,yan12125/libchewing,Chocobo1/libchewing,hiunnhue/libchewing,PeterDaveHello/libchewing,PingNote/libchewing,chewing/libchewing,mangokingTW/libchewing,cwlin/libchewing,bbyykk/libtaigi,hiunnhue/libchewing,kito-cheng/libchewing,mangokingTW/libchewing,Chocobo1/libchewing,hiunnhue/libchewing,yan12125/libchewing,dimotsai/libchewing,yan12125/libchewing,ShengYenPeng/libchewing,czchen/libchewing,PingNote/libchewing,cwlin/libchewing,chewing/libchewing,simonfork/libchewing,hiunnhue/libchewing,simonfork/libchewing,dimotsai/libchewing,czchen/libchewing,cwlin/libchewing,bbyykk/libtaigi,ShengYenPeng/libchewing,simonfork/libchewing,PeterDaveHello/libchewing,mangokingTW/libchewing,ShengYenPeng/libchewing,chewing/libchewing,PeterDaveHello/libchewing,cwlin/libchewing,ShengYenPeng/libchewing,czchen/libchewing,PingNote/libchewing,yan12125/libchewing,hiunnhue/libchewing,mangokingTW/libchewing,bbyykk/libtaigi,bbyykk/libtaigi,chewing/libchewing,simonfork/libchewing,kito-cheng/libchewing,bbyykk/libtaigi,kito-cheng/libchewing,robert501128/libchewing,czchen/libchewing,robert501128/libchewing