Return Node on call to Connect()

[cheynearista]

Addresses issue #9 Most all api calls require a Node instance to perform any functional action on the device. It doesn't make sense to return EapiConnetionEntity from a call to Connect(). Instead, we should return Node.

• Change Connect() to return Node
• Create Connection() call to create a connection and return EapiConnetionEntity.

[codecov-io]

Codecov Report

Merging #18 into develop will increase coverage by 0.03%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop      #18      +/-   ##
===========================================
+ Coverage    88.56%   88.59%   +0.03%     
===========================================
  Files           15       15              
  Lines         2011     2017       +6     
===========================================
+ Hits          1781     1787       +6     
  Misses         195      195              
  Partials        35       35

Impacted Files	Coverage Δ
client.go	91.86% <100%> (+0.2%)	:arrow_up:

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