Logstash HTTP Device

[hle-skillz]

Fixes #135.

Rudimentary HTTP Device that relies on buffering (inherits Connectable) rather than persistent HTTP connections (no-op connect) for efficiency.

Existing framework code inconveniently deleted uri and type options:

logstash-logger/lib/logstash-logger/device.rb

Lines 30 to 35 in b8f5403

	if parsed_uri_opts = parse_uri_config(opts)
	opts.delete(:uri)
	opts.merge!(parsed_uri_opts)
	end
	type = opts.delete(:type) || DEFAULT_TYPE

so I had to use parameter name url to allow simple configuration relying on Net::HTTP to auto-detect SSL, otherwise this could've been a one-liner setup:

LogStashLogger.new uri: 'https://logstash.example.com'

[codecov-commenter]

Codecov Report

Merging #163 into master will decrease coverage by 0.13%.
The diff coverage is 95.65%.

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
- Coverage   92.68%   92.54%   -0.14%     
==========================================
  Files          64       66       +2     
  Lines        1668     1691      +23     
==========================================
+ Hits         1546     1565      +19     
- Misses        122      126       +4     

Impacted Files	Coverage Δ
lib/logstash-logger/device/http.rb	93.33% <93.33%> (ø)
lib/logstash-logger/device.rb	98.07% <100.00%> (+0.07%)	⬆️
spec/device/http_spec.rb	100.00% <100.00%> (ø)
lib/logstash-logger/device/kinesis.rb	88.88% <0.00%> (-5.56%)	⬇️
lib/logstash-logger/device/firehose.rb	88.88% <0.00%> (-5.56%)	⬇️
lib/logstash-logger/device/tcp.rb	94.11% <0.00%> (-1.97%)	⬇️

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