v1.0.0-beta.1

Major restructuring of the codebase:

• Factoring of the source: abstraction of async access to parts of a file
• Initial parsing, image access and data reading is now asynchronous
• Enabling use of web-worker pools to improve decoding performance
• Replacing browserify with webpack

New features:

• Predictor support for deflate compression
• JPEG compression

Various bug fixes