compressor: replace snappy with cramjam #134
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About this change - What it does
Replaces the python-snappy dependency with cramjam.
Why this way
The python-snappy library is no longer maintained (see 1). Cramjam is a drop-in replacement that allows for a considerable speedup both in the compression and decompression tasks. The relevant benchmark for snappy's framed format 2.
Before we accept this PR, we should benchmark cramjam ourselves with realistic workloads.