Adding support for namespaces

[davissp14]

Enables namespace support.

[codecov]

Codecov Report

Merging #134 (1de1126) into master (57923e8) will increase coverage by 0.02%.
The diff coverage is 99.29%.

@@            Coverage Diff             @@
##           master     #134      +/-   ##
==========================================
+ Coverage   99.15%   99.17%   +0.02%     
==========================================
  Files          30       39       +9     
  Lines        1662     2072     +410     
==========================================
+ Hits         1648     2055     +407     
- Misses         14       17       +3     

Impacted Files	Coverage Δ
lib/etcdv3/namespace/utilities.rb	95.83% <95.83%> (ø)
lib/etcdv3/namespace/watch.rb	96.15% <96.15%> (ø)
lib/etcdv3/namespace/kv.rb	97.36% <97.36%> (ø)
lib/etcdv3.rb	100.00% <100.00%> (ø)
lib/etcdv3/connection.rb	93.10% <100.00%> (+1.79%)	⬆️
lib/etcdv3/connection_wrapper.rb	97.29% <100.00%> (ø)
lib/etcdv3/namespace/kv/requests.rb	100.00% <100.00%> (ø)
lib/etcdv3/namespace/kv/transaction.rb	100.00% <100.00%> (ø)
lib/etcdv3/namespace/lock.rb	100.00% <100.00%> (ø)
spec/etcdv3/connection_spec.rb	100.00% <100.00%> (ø)
... and 16 more

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