http: Fix gzip with small files again. Compressing very small files
can make them larger. Increase minimum file size for compression
from 100 to 150 bytes, log compression failures again (output
buffer was too small for the enlarged file), use an output buffer
larger than the input buffer to make space for gzip header. If
the file gets larger, send uncompressed version.
Moved version number to a single file (VERSION) to ease up
version bumping.
version 2.0.6
Merge branch 'master' into protobuf