Pluggable compression for cache values. #107

Job	Run time
rubocop	11s
test (2.7, Gemfile, sqlite3:///tmp/test.sqlite3)	1m 23s
test (2.7, Gemfile, mysql2://root:pass@127.0.0.1/test)	1m 20s
test (2.7, Gemfile, postgres://root:pass@127.0.0.1/test)	1m 13s
test (2.7, Gemfile.rails6, sqlite3:///tmp/test.sqlite3)	1m 3s
test (2.7, Gemfile.rails6, mysql2://root:pass@127.0.0.1/test)	1m 16s
test (2.7, Gemfile.rails6, postgres://root:pass@127.0.0.1/test)	1m 4s
test (3.0, Gemfile, sqlite3:///tmp/test.sqlite3)	54s
test (3.0, Gemfile, mysql2://root:pass@127.0.0.1/test)	59s
test (3.0, Gemfile, postgres://root:pass@127.0.0.1/test)	59s
test (3.0, Gemfile.rails6, sqlite3:///tmp/test.sqlite3)	48s
test (3.0, Gemfile.rails6, mysql2://root:pass@127.0.0.1/test)	1m 2s
test (3.0, Gemfile.rails6, postgres://root:pass@127.0.0.1/test)	52s
test (3.1, Gemfile, sqlite3:///tmp/test.sqlite3)	48s
test (3.1, Gemfile, mysql2://root:pass@127.0.0.1/test)	46s
test (3.1, Gemfile, postgres://root:pass@127.0.0.1/test)	1m 2s
test (3.1, Gemfile.rails6, sqlite3:///tmp/test.sqlite3)	56s
test (3.1, Gemfile.rails6, mysql2://root:pass@127.0.0.1/test)	49s
test (3.1, Gemfile.rails6, postgres://root:pass@127.0.0.1/test)	56s
test (3.2, Gemfile, sqlite3:///tmp/test.sqlite3)	51s
test (3.2, Gemfile, mysql2://root:pass@127.0.0.1/test)	1m 1s
test (3.2, Gemfile, postgres://root:pass@127.0.0.1/test)	50s
test (3.2, Gemfile.rails6, sqlite3:///tmp/test.sqlite3)	54s
test (3.2, Gemfile.rails6, mysql2://root:pass@127.0.0.1/test)	53s
test (3.2, Gemfile.rails6, postgres://root:pass@127.0.0.1/test)	58s
	23m 48s

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