popovers: Span user profile popover to full width on narrow screens.
popovers: Span user profile popover to full width on narrow screens.

bootstrap introduced a max-width attribute to `.popover` when
it was upgraded to v2.3.2. We override the property here to fix this.

hackerkid/zulip,eeshangarg/zulip,andersk/zulip,andersk/zulip,punchagan/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,showell/zulip,rht/zulip,hackerkid/zulip,rht/zulip,rht/zulip,punchagan/zulip,kou/zulip,showell/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,zulip/zulip,andersk/zulip,punchagan/zulip,showell/zulip,andersk/zulip,rht/zulip,punchagan/zulip,eeshangarg/zulip,eeshangarg/zulip,hackerkid/zulip,showell/zulip,punchagan/zulip,showell/zulip,zulip/zulip,zulip/zulip,showell/zulip,hackerkid/zulip,kou/zulip,punchagan/zulip,kou/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip,kou/zulip,hackerkid/zulip,rht/zulip,eeshangarg/zulip,punchagan/zulip,rht/zulip,showell/zulip