2.2.0: Add GDALRasterIO and related methods

• Adds methods related to GDALRasterIO and GDALDatasetRasterIO
• Adds an example of using GDALDatasetRasterIO to the thumbnail example.

2.1.0: Upgrade to GDAL 2.4, add OGR methods

• Upgrades to latest Emscripten version (and removes pinning, because it wasn't working for me at the time).
• Upgrades to GDAL 2.4
• Adds numerous exported methods, including GDALPolygonize and OGR-related methods.

2.0.0

Upgrades Emscripten to the latest version.

• Upgrade Emscripten by @ddohler in #36

1.1.3

Export additional GDAL functions:

• GDALRasterize
• GDALRasterizeOptionsNew
• GDALRasterizeOptionsFree
• GDALDEMProcessing
• GDALDEMProcessingOptionsNew
• GDALDEMProcessingOptionsFree

1.1.2

• Compile in GDAL's internal JPEG support. Adds ~200KB to binary size.

1.1.0

Add functions from cpl_error.h to support better error handling from JS code. The added functions are:

• CPLError
• CPLSetErrorHandler
• CPLQuietErrorHandler
• CPLErrorReset
• CPLGetLastErrorMsg
• CPLGetLastErrorNo
• CPLGetLastErrorType

1.0.0

Publish to NPM and update README. This is functionally identical to the 0.0.4 release.

0.0.4

• Add support and example for tiled previews of GeoTIFFs
• Switch to WebAssembly format

0.0.3

Add support and examples for many new GDAL functions.

Available GDAL functions:

• CSLCount
• GDALSetCacheMax
• GDALAllRegister
• GDALOpen
• GDALClose
• GDALGetDriverByName
• GDALCreate
• GDALCreateCopy
• GDALGetRasterXSize
• GDALGetRasterYSize
• GDALGetRasterCount
• GDALGetRasterDataType
• GDALGetRasterBand
• GDALGetProjectionRef
• GDALSetProjection
• GDALGetGeoTransform
• GDALSetGeoTransform
• OSRNewSpatialReference
• OSRImportFromEPSG
• OCTNewCoordinateTransformation
• OCTTransform
• GDALCreateGenImgProjTransformer
• GDALGenImgProjTransform
• GDALDestroyGenImgProjTransformer
• GDALSuggestedWarpOutput
• GDALTranslate
• GDALTranslateOptionsNew
• GDALTranslateOptionsFree
• GDALReprojectImage

0.0.2

• Reduce compiled Javascript size
• Removes internal JPEG and PNG support, and compiles without threads.
• Compiles using Emscripten's Oz optimization flag