Fix header cell tooltip showing 'undefined' (since span replaced with anchors)
Fix header cell tooltip showing 'undefined' (since span replaced with anchors)

buckett/sakai-gitflow,lorenamgUMU/sakai,rodriguezdevera/sakai,liubo404/sakai,bzhouduke123/sakai,Fudan-University/sakai,lorenamgUMU/sakai,OpenCollabZA/sakai,ouit0408/sakai,pushyamig/sakai,ouit0408/sakai,ouit0408/sakai,conder/sakai,ouit0408/sakai,kwedoff1/sakai,Fudan-University/sakai,ouit0408/sakai,liubo404/sakai,duke-compsci290-spring2016/sakai,buckett/sakai-gitflow,clhedrick/sakai,clhedrick/sakai,pushyamig/sakai,conder/sakai,willkara/sakai,rodriguezdevera/sakai,liubo404/sakai,ktakacs/sakai,kwedoff1/sakai,buckett/sakai-gitflow,bzhouduke123/sakai,kwedoff1/sakai,buckett/sakai-gitflow,ouit0408/sakai,frasese/sakai,willkara/sakai,willkara/sakai,colczr/sakai,duke-compsci290-spring2016/sakai,ktakacs/sakai,maurercw/gradebookNG,liubo404/sakai,rodriguezdevera/sakai,lorenamgUMU/sakai,kwedoff1/sakai,maurercw/gradebookNG,Fudan-University/sakai,bzhouduke123/sakai,Fudan-University/sakai,clhedrick/sakai,colczr/sakai,colczr/sakai,kwedoff1/sakai,steveswinsburg/gradebookNG,OpenCollabZA/sakai,frasese/sakai,rodriguezdevera/sakai,kwedoff1/sakai,Fudan-University/sakai,willkara/sakai,lorenamgUMU/sakai,rodriguezdevera/sakai,frasese/sakai,pushyamig/sakai,ouit0408/sakai,zqian/sakai,clhedrick/sakai,ktakacs/sakai,pushyamig/sakai,kwedoff1/sakai,bzhouduke123/sakai,pushyamig/sakai,conder/sakai,clhedrick/sakai,lorenamgUMU/sakai,frasese/sakai,ktakacs/sakai,colczr/sakai,liubo404/sakai,bzhouduke123/sakai,bzhouduke123/sakai,colczr/sakai,Fudan-University/sakai,lorenamgUMU/sakai,steveswinsburg/gradebookNG,Fudan-University/sakai,OpenCollabZA/sakai,conder/sakai,zqian/sakai,joserabal/sakai,buckett/sakai-gitflow,zqian/sakai,rodriguezdevera/sakai,colczr/sakai,steveswinsburg/gradebookNG,buckett/sakai-gitflow,joserabal/sakai,willkara/sakai,rodriguezdevera/sakai,duke-compsci290-spring2016/sakai,lorenamgUMU/sakai,OpenCollabZA/sakai,maurercw/gradebookNG,conder/sakai,willkara/sakai,colczr/sakai,kwedoff1/sakai,ktakacs/sakai,bzhouduke123/sakai,bzhouduke123/sakai,liubo404/sakai,Fudan-University/sakai,colczr/sakai,ouit0408/sakai,clhedrick/sakai,willkara/sakai,frasese/sakai,joserabal/sakai,zqian/sakai,zqian/sakai,joserabal/sakai,OpenCollabZA/sakai,clhedrick/sakai,duke-compsci290-spring2016/sakai,ktakacs/sakai,buckett/sakai-gitflow,pushyamig/sakai,frasese/sakai,zqian/sakai,conder/sakai,duke-compsci290-spring2016/sakai,buckett/sakai-gitflow,conder/sakai,zqian/sakai,ktakacs/sakai,joserabal/sakai,joserabal/sakai,OpenCollabZA/sakai,lorenamgUMU/sakai,duke-compsci290-spring2016/sakai,willkara/sakai,pushyamig/sakai,ktakacs/sakai,conder/sakai,duke-compsci290-spring2016/sakai,clhedrick/sakai,duke-compsci290-spring2016/sakai,frasese/sakai,OpenCollabZA/sakai,joserabal/sakai,OpenCollabZA/sakai,rodriguezdevera/sakai,frasese/sakai,joserabal/sakai,liubo404/sakai,pushyamig/sakai,zqian/sakai,liubo404/sakai