migrated message tool (for recent chat, discussion, etc), moved the message api and impl to the new message module from announcement
migrated message tool (for recent chat, discussion, etc), moved the message api and impl to the new message module from announcement

git-svn-id: fab90691c48d5ca7a10abbf63dc51a00ff75d934@8264 66ffb92e-73f9-0310-93c1-f5514f145a0a

Fudan-University/sakai,hackbuteer59/sakai,joserabal/sakai,noondaysun/sakai,surya-janani/sakai,colczr/sakai,OpenCollabZA/sakai,bkirschn/sakai,hackbuteer59/sakai,wfuedu/sakai,noondaysun/sakai,liubo404/sakai,puramshetty/sakai,lorenamgUMU/sakai,clhedrick/sakai,duke-compsci290-spring2016/sakai,willkara/sakai,kingmook/sakai,joserabal/sakai,frasese/sakai,buckett/sakai-gitflow,OpenCollabZA/sakai,wfuedu/sakai,tl-its-umich-edu/sakai,kingmook/sakai,surya-janani/sakai,ouit0408/sakai,introp-software/sakai,hackbuteer59/sakai,noondaysun/sakai,puramshetty/sakai,ouit0408/sakai,bkirschn/sakai,udayg/sakai,liubo404/sakai,conder/sakai,joserabal/sakai,joserabal/sakai,whumph/sakai,udayg/sakai,whumph/sakai,joserabal/sakai,noondaysun/sakai,lorenamgUMU/sakai,puramshetty/sakai,liubo404/sakai,pushyamig/sakai,lorenamgUMU/sakai,surya-janani/sakai,bzhouduke123/sakai,tl-its-umich-edu/sakai,bzhouduke123/sakai,kwedoff1/sakai,willkara/sakai,introp-software/sakai,ktakacs/sakai,introp-software/sakai,surya-janani/sakai,colczr/sakai,ouit0408/sakai,puramshetty/sakai,bzhouduke123/sakai,clhedrick/sakai,zqian/sakai,bkirschn/sakai,introp-software/sakai,wfuedu/sakai,ktakacs/sakai,tl-its-umich-edu/sakai,duke-compsci290-spring2016/sakai,Fudan-University/sakai,clhedrick/sakai,ktakacs/sakai,udayg/sakai,Fudan-University/sakai,conder/sakai,ouit0408/sakai,clhedrick/sakai,pushyamig/sakai,wfuedu/sakai,puramshetty/sakai,whumph/sakai,kingmook/sakai,whumph/sakai,surya-janani/sakai,kingmook/sakai,introp-software/sakai,frasese/sakai,bzhouduke123/sakai,Fudan-University/sakai,rodriguezdevera/sakai,conder/sakai,conder/sakai,OpenCollabZA/sakai,pushyamig/sakai,puramshetty/sakai,kwedoff1/sakai,bzhouduke123/sakai,buckett/sakai-gitflow,zqian/sakai,bzhouduke123/sakai,pushyamig/sakai,rodriguezdevera/sakai,zqian/sakai,bzhouduke123/sakai,tl-its-umich-edu/sakai,duke-compsci290-spring2016/sakai,OpenCollabZA/sakai,lorenamgUMU/sakai,colczr/sakai,ktakacs/sakai,clhedrick/sakai,duke-compsci290-spring2016/sakai,wfuedu/sakai,wfuedu/sakai,Fudan-University/sakai,ouit0408/sakai,puramshetty/sakai,udayg/sakai,surya-janani/sakai,buckett/sakai-gitflow,joserabal/sakai,colczr/sakai,surya-janani/sakai,udayg/sakai,duke-compsci290-spring2016/sakai,rodriguezdevera/sakai,kingmook/sakai,zqian/sakai,Fudan-University/sakai,hackbuteer59/sakai,Fudan-University/sakai,zqian/sakai,udayg/sakai,rodriguezdevera/sakai,ouit0408/sakai,tl-its-umich-edu/sakai,noondaysun/sakai,pushyamig/sakai,liubo404/sakai,OpenCollabZA/sakai,noondaysun/sakai,willkara/sakai,whumph/sakai,liubo404/sakai,kingmook/sakai,bkirschn/sakai,colczr/sakai,introp-software/sakai,buckett/sakai-gitflow,rodriguezdevera/sakai,zqian/sakai,wfuedu/sakai,lorenamgUMU/sakai,introp-software/sakai,liubo404/sakai,noondaysun/sakai,conder/sakai,udayg/sakai,conder/sakai,wfuedu/sakai,bkirschn/sakai,ktakacs/sakai,pushyamig/sakai,kwedoff1/sakai,surya-janani/sakai,duke-compsci290-spring2016/sakai,kwedoff1/sakai,zqian/sakai,kwedoff1/sakai,colczr/sakai,hackbuteer59/sakai,OpenCollabZA/sakai,ktakacs/sakai,frasese/sakai,willkara/sakai,tl-its-umich-edu/sakai,noondaysun/sakai,OpenCollabZA/sakai,colczr/sakai,kwedoff1/sakai,kingmook/sakai,puramshetty/sakai,conder/sakai,pushyamig/sakai,frasese/sakai,bkirschn/sakai,hackbuteer59/sakai,udayg/sakai,duke-compsci290-spring2016/sakai,whumph/sakai,willkara/sakai,frasese/sakai,joserabal/sakai,ktakacs/sakai,clhedrick/sakai,zqian/sakai,frasese/sakai,Fudan-University/sakai,tl-its-umich-edu/sakai,lorenamgUMU/sakai,rodriguezdevera/sakai,whumph/sakai,frasese/sakai,conder/sakai,hackbuteer59/sakai,kwedoff1/sakai,liubo404/sakai,buckett/sakai-gitflow,bkirschn/sakai,willkara/sakai,bkirschn/sakai,buckett/sakai-gitflow,whumph/sakai,ouit0408/sakai,lorenamgUMU/sakai,hackbuteer59/sakai,bzhouduke123/sakai,liubo404/sakai,lorenamgUMU/sakai,buckett/sakai-gitflow,colczr/sakai,tl-its-umich-edu/sakai,ouit0408/sakai,buckett/sakai-gitflow,rodriguezdevera/sakai,frasese/sakai,kingmook/sakai,clhedrick/sakai,joserabal/sakai,willkara/sakai,introp-software/sakai,pushyamig/sakai,rodriguezdevera/sakai,kwedoff1/sakai,willkara/sakai,OpenCollabZA/sakai,ktakacs/sakai,duke-compsci290-spring2016/sakai,clhedrick/sakai