v0.1.0: psy-view: An ncview-like interface for psyplot

Changed

• The plotmethod tabs have now a more intuitive gridlayout (see
  #46)
• When closing the mainwindow of psy-view now, one closes all open
  windows (i.e. also the open figures, see
  #47)

Added

• A widget to control the plot type for mapplot and plot2d (see
  #46)
• A button to reload all plots. This is useful, for instance, if the
  data on your disk changed and you just want to update the plot
  #48)