Enable streaming file output #126
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This replaces Rubyzip with ZipTricks, and adds `render_to` on the Document class. `render_to` will write to any IO object without needing it to be rewindable or seekable. This permits output to a socket or to a streaming web response, and allows memory savings when the output is large. The deflated writer in ZipTricks also regularly flushes the written bytes, making sure that not too many string buffers get accumulated.
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This replaces Rubyzip with ZipTricks, and adds
render_toon the Document class.render_towill write to any IO object without needing it to be rewindable or seekable.This permits output to a socket or to a streaming web response, and allows memory savings when the output is large. The deflated writer in ZipTricks also regularly flushes the written bytes, making sure that not too many string buffers get accumulated.