Allocate less Arrays and Strings when writing a zip
Speed up Deflater sysread speed when number_of_bytes is small and @output_buffer is large
Merge pull request #129 from loadhigh/master

Speed up Deflater sysread speed when number_of_bytes is small and @output_buffer is large
File.exists? -> File.exist?
Merge pull request #134 from srawlins/use-file-exist

File.exists? -> File.exist?
Merge pull request #130 from srawlins/less-allocations-writing-a-zipfile

Allocate less Arrays and Strings when writing a zip