Fixed plot() and peek() so that their behavior is consistent with map and with matplotlib
Fixed plot() and peek() so that their behavior is consistent with map and with matplotlib

dpshelio/sunpy,dpshelio/sunpy,mjm159/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,mjm159/sunpy,Alex-Ian-Hamilton/sunpy,Alex-Ian-Hamilton/sunpy