(Engine) Variety of engine updates

[shazbert]

Description

Just little changes I found when looking at the totality of the engine branch compared to master.

Type of change

Please delete options that are not relevant and add an x in [] as item is complete.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

locally

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation and regenerated documentation via the documentation tool
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally and on Travis with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Merging #390 into engine will decrease coverage by 0.04%.
The diff coverage is 22.91%.

@@            Coverage Diff            @@
##           engine    #390      +/-   ##
=========================================
- Coverage   41.44%   41.4%   -0.05%     
=========================================
  Files         167     167              
  Lines       38224   38207      -17     
=========================================
- Hits        15842   15818      -24     
- Misses      21276   21281       +5     
- Partials     1106    1108       +2

Impacted Files	Coverage Δ
dispatch/mux.go	93.75% <ø> (ø)	⬆️
engine/connection.go	64.51% <ø> (ø)	⬆️
exchanges/btse/btse_websocket.go	0% <0%> (ø)	⬆️
exchanges/alphapoint/alphapoint.go	17.59% <0%> (ø)	⬆️
exchanges/itbit/itbit.go	62.17% <0%> (ø)	⬆️
exchanges/zb/zb_websocket.go	1.87% <0%> (ø)	⬆️
exchanges/request/request.go	72.24% <0%> (ø)	⬆️
exchanges/hitbtc/hitbtc_websocket.go	0% <0%> (ø)	⬆️
exchanges/lakebtc/lakebtc.go	55.17% <0%> (ø)	⬆️
exchanges/bitstamp/bitstamp_websocket.go	0% <0%> (ø)	⬆️
... and 46 more

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[gloriousCode]

tACK! Good stuff 🐑🐑🐑🐑🐑🐑🐑🐑🐺

[thrasher-]

tACK 👍

[xtda]

approved

[MadCozBadd]

Nicee!!!