Axis sharing doesn't work for geo-axis #178

import proplot as plot
f, axs = plot.subplots(nrows=2, ncols=2,
                       spany=3, sharey=3,
                       proj='lcc', proj_kw={'lon_0': 116}
                       )
axs.format(coast=True,
           latlines=1, lonlines=1,
           labels=True,
           lonlim=(113, 119),
           latlim=(37, 41.5),
           )

import matplotlib.pyplot as plt
import cartopy.crs as ccrs

proj = ccrs.LambertConformal(central_longitude=116)
fig, axs = plt.subplots(nrows=2, ncols=2,
                        subplot_kw={'projection': proj})

for idx,ax in enumerate(axs.flatten()):
    ax.set_extent([113, 119, 37, 41.5], ccrs.PlateCarree())
    gl = ax.gridlines(crs=ccrs.PlateCarree(), draw_labels=True,
                      color='gray', alpha=0.5, linestyle='--',
                      x_inline=False, y_inline=False)
    gl.xlabels_top = False
    gl.ylabels_right = False
    if idx%2 != 0:
        gl.ylabels_left = False
    ax.coastlines()