Bump version to 1.3.1.
Bump version to 1.3.1.

serj-lotutovici/butterknife,zhakui/butterknife,github609195946/butterknife,risedrag/butterknife,artem-zinnatullin/butterknife,ChristianBecker/butterknife,zhakui/butterknife,yuhuayi/butterknife,ruhaly/butterknife,byterom/android_external_JakeWharton_butterknife,tanweijiu/butterknife,SOFTPOWER1991/butterknife,YuzurihaInori/butterknife,ChinaKim/butterknife,ThirdProject/android_external_JakeWharton_butterknife,Shedings/butterknife,kevinmost/butterknife,tanweijiu/butterknife,healthy-tree/butterknife,AmberWhiteSky/butterknife,ptornhult/butterknife,tbsandee/butterknife,oguzbabaoglu/butterfork,huangsongyan/butterknife,hzsweers/butterknife,srayhunter/butterknife,wuseal/butterknife,Orbar/butterknife,kaoree/butterknife,treejames/butterknife,dreamseekerkun/butterknife,huanting/butterknife,wangkr/butterknife,littlezan/butterknife,kaoree/butterknife,wenxueliu/butterknife,qingsong-xu/butterknife,vamsirajendra/butterknife,tsunli/butterknife,wuman/butterknife,ta893115871/butterknife,huangsongyan/butterknife,JudeRosario/butterknife,Orbar/butterknife,b-cuts/butterknife,jbc25/butterknife,lockerfish/butterknife,NortonAhu/butterknife,JudeRosario/butterknife,nabishpaul/butterknife,JakeWharton/butterknife,ze-pequeno/butterknife,yuanbo1026/butterknife,OneRom/external_butterknife,JudeRosario/butterknife,yushiwo/butterknife,yuanhuihui/butterknife,Scanor/butterknife,lockerfish/butterknife,wuzheng4android/butterknife,jam0cam/butterknife,OneRom/external_butterknife,NortonAhu/butterknife,lukaciko/butterknife,qingsong-xu/butterknife,GeekHades/butterknife,JasonWKS/butterknife,dreamseekerkun/butterknife,carollynn2253/butterknife,zheng1733/butterknife,JakeWharton/butterknife,haoyh/butterknife,risedrag/butterknife,suzukaze/butterknife,vamsirajendra/butterknife,yushiwo/butterknife,artem-zinnatullin/butterknife,srayhunter/butterknife,JakeWharton/butterknife,byterom/android_external_JakeWharton_butterknife,yigeyidian/butterknife,ze-pequeno/butterknife,rajyvan/butterknife,sunios/butterknife,ChinaKim/butterknife,jam0cam/butterknife,wuzheng4android/butterknife,ptornhult/butterknife,jvvlives2005/butterknife,jbc25/butterknife,MichaelEvans/butterknife,androidgilbert/butterknife,sunios/butterknife,sylsi/butterknife,Orbar/butterknife,renatohsc/butterknife,KristenXu/butterknife,yuanbo1026/butterknife,renatohsc/butterknife,rajyvan/butterknife,carollynn2253/butterknife,omegasoft7/butterknife,newtonker/butterknife,ze-pequeno/butterknife,luinnx/butterknife,jvvlives2005/butterknife,yadihaoku/butterknife,SOFTPOWER1991/butterknife,yuanbo1026/butterknife,sylsi/butterknife,yushiwo/butterknife,zheng1733/butterknife,androidgilbert/butterknife,xfumihiro/butterknife,JackLeeMing/butterknife,Scanor/butterknife,dance609195946/butterknife,JuranoSaurus/butterknife,luinnx/butterknife,treejames/butterknife,appdevzhang/butterknife,serj-lotutovici/butterknife,serj-lotutovici/butterknife,wenxueliu/butterknife,JackLeeMing/butterknife,pyricau/butterknife,tanweijiu/butterknife,JuranoSaurus/butterknife,huanting/butterknife,oguzbabaoglu/butterfork,jbc25/butterknife,PAC-ROM/android_external_JakeWharton_butterknife,ChinaKim/butterknife,hgl888/butterknife,dance609195946/butterknife,hzsweers/butterknife,yuhuayi/butterknife,Peter32/butterknife,Shedings/butterknife,KoMinkyu/butterknife,JasonWKS/butterknife,chuangWu/butterknife,tsunli/butterknife,ta893115871/butterknife,YuzurihaInori/butterknife,JellyBeanIdea/butterknife,Peter32/butterknife,appdevzhang/butterknife,ChristianBecker/butterknife,yadihaoku/butterknife,hgl888/butterknife,eleme/butterknife,JuranoSaurus/butterknife,deveshmittal/butterknife,krumman/butterknife,NortonAhu/butterknife,pyricau/butterknife,androidgilbert/butterknife,rajyvan/butterknife,JakeWharton/butterknife,kaoree/butterknife,KoMinkyu/butterknife,ptornhult/butterknife,lukaciko/butterknife,eleme/butterknife,ChristianBecker/butterknife,xfumihiro/butterknife,artem-zinnatullin/butterknife,github609195946/butterknife,Shedings/butterknife,ruhaly/butterknife,OneRom/external_butterknife,dance609195946/butterknife,renatohsc/butterknife,jam0cam/butterknife,lukaciko/butterknife,YuzurihaInori/butterknife,suzukaze/butterknife,dreamseekerkun/butterknife,KristenXu/butterknife,suzukaze/butterknife,qingsong-xu/butterknife,JellyBeanIdea/butterknife,ThirdProject/android_external_JakeWharton_butterknife,sunios/butterknife,littlezan/butterknife,risedrag/butterknife,kevinmost/butterknife,AmberWhiteSky/butterknife,wuseal/butterknife,krumman/butterknife,Scanor/butterknife,lockerfish/butterknife,chuangWu/butterknife,KristenXu/butterknife,tsunli/butterknife,GeekHades/butterknife,vamsirajendra/butterknife,nabishpaul/butterknife,xfumihiro/butterknife,yuanhuihui/butterknife,tbsandee/butterknife,PAC-ROM/android_external_JakeWharton_butterknife,b-cuts/butterknife,chuangWu/butterknife,luinnx/butterknife,xsingHu/butterknife,hgl888/butterknife,b-cuts/butterknife,ChristianBecker/butterknife,yuhuayi/butterknife,tbsandee/butterknife,carollynn2253/butterknife,jvvlives2005/butterknife,haoyh/butterknife,eleme/butterknife,PAC-ROM/android_external_JakeWharton_butterknife,xsingHu/butterknife,healthy-tree/butterknife,ThirdProject/android_external_JakeWharton_butterknife,ruhaly/butterknife,JackLeeMing/butterknife,MichaelEvans/butterknife,healthy-tree/butterknife,yadihaoku/butterknife,MichaelEvans/butterknife,JellyBeanIdea/butterknife,zhakui/butterknife,hzsweers/butterknife,KoMinkyu/butterknife,treejames/butterknife,wangkr/butterknife,wuman/butterknife,krumman/butterknife,SOFTPOWER1991/butterknife,newtonker/butterknife,wuman/butterknife,yigeyidian/butterknife,huanting/butterknife,wangkr/butterknife,yigeyidian/butterknife,GeekHades/butterknife,yuanhuihui/butterknife,oguzbabaoglu/butterfork,omegasoft7/butterknife,ta893115871/butterknife,newtonker/butterknife,wuseal/butterknife,zheng1733/butterknife,huangsongyan/butterknife,github609195946/butterknife,littlezan/butterknife,JasonWKS/butterknife,byterom/android_external_JakeWharton_butterknife,ze-pequeno/butterknife,srayhunter/butterknife,appdevzhang/butterknife,sylsi/butterknife,haoyh/butterknife,nabishpaul/butterknife,Peter32/butterknife,xsingHu/butterknife,wenxueliu/butterknife,AmberWhiteSky/butterknife,kevinmost/butterknife,deveshmittal/butterknife,wuzheng4android/butterknife