Fix mobile navbar issue (#712)
Fix mobile navbar issue (#712)

* hide apache feather on smaller screens

* apply hidden-md-down class to anchor rather than to image

massakam/pulsar,jai1/pulsar,ArvinDevel/incubator-pulsar,ArvinDevel/incubator-pulsar,nkurihar/pulsar,yahoo/pulsar,sschepens/pulsar,massakam/pulsar,yush1ga/pulsar,nkurihar/pulsar,sschepens/pulsar,sschepens/pulsar,sschepens/pulsar,merlimat/pulsar,saandrews/pulsar,jai1/pulsar,merlimat/pulsar,tkb77/pulsar,merlimat/pulsar,saandrews/pulsar,saandrews/pulsar,jai1/pulsar,tkb77/pulsar,tkb77/pulsar,yush1ga/pulsar,nkurihar/pulsar,merlimat/pulsar,yush1ga/pulsar,tkb77/pulsar,yush1ga/pulsar,saandrews/pulsar,massakam/pulsar,jai1/pulsar,jai1/pulsar,saandrews/pulsar,tkb77/pulsar,saandrews/pulsar,saandrews/pulsar,jai1/pulsar,yahoo/pulsar,yush1ga/pulsar,merlimat/pulsar,yahoo/pulsar,nkurihar/pulsar,ArvinDevel/incubator-pulsar,yush1ga/pulsar,massakam/pulsar,jai1/pulsar,yahoo/pulsar,ArvinDevel/incubator-pulsar,jai1/pulsar,tkb77/pulsar,ArvinDevel/incubator-pulsar,jai1/pulsar,saandrews/pulsar,sschepens/pulsar,yush1ga/pulsar,ArvinDevel/incubator-pulsar,massakam/pulsar,merlimat/pulsar,nkurihar/pulsar,sschepens/pulsar,tkb77/pulsar,massakam/pulsar,nkurihar/pulsar,yahoo/pulsar,nkurihar/pulsar,ArvinDevel/incubator-pulsar,nkurihar/pulsar,sschepens/pulsar,yush1ga/pulsar,yahoo/pulsar,sschepens/pulsar,ArvinDevel/incubator-pulsar,nkurihar/pulsar,tkb77/pulsar