* Add binary_compression value to each package
* Remove binary_url values and arrays
* Handle packages with empty binary_sha256 arrays (either missing binaries or not compiled by us)
* Rename IgnoredPatterns to AllowedPatterns.
* Exclude docopt.rb (not our code) from Rubocop
* Disable Style/RedundantReturn
* Disable Style/MutableConstant
* Disable Style/NumericLiterals
* Set Layout/IndentationStyle to spaces
* Temporarily disable various cops.
* Add Rubocop CI via Octocop
* Lint tree with rubocop -A -c .rubocop.yml
Co-authored-by: Satadru Pramanik <satadru@gmail.com>
Leveldb has switched to CMake and the package has been updated to
reflect that. Google's snappy compression library is required as a
dependency and has been added as a new package.
Tested on ARM.