Changes

• ENH: Allow passing in kwargs to rio.reproject (issue #369; pull #370)
• ENH: Allow nodata override and provide default nodata based on dtype in rio.reproject (pull #370)
• ENH: Add support for passing in gcps to rio.reproject (issue #339; pull #370)
• BUG: Remove duplicate acquire in open_rasterio (pull #364)
• BUG: Fix exporting dataset to raster with non-standard dimensions (issue #372)