HTML responses

[fmigneault]

fixes #210
relates to #615

Resolves GD-533

Examples of HTML outputs produced:

[codecov]

Codecov Report

Attention: Patch coverage is 97.33333% with 12 lines in your changes missing coverage. Please review.

Project coverage is 85.78%. Comparing base (7f3c72c) to head (cef5117).
Report is 334 commits behind head on master.

Files with missing lines	Patch %	Lines
weaver/formats.py	86.20%	2 Missing and 2 partials ⚠️
weaver/wps_restapi/__init__.py	91.66%	1 Missing and 2 partials ⚠️
weaver/wps_restapi/processes/processes.py	94.11%	1 Missing and 1 partial ⚠️
weaver/wps_restapi/swagger_definitions.py	95.12%	1 Missing and 1 partial ⚠️
weaver/wps_restapi/api.py	98.82%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #636    +/-   ##
========================================
  Coverage   85.77%   85.78%            
========================================
  Files          79       79            
  Lines       18951    19068   +117     
  Branches     2929     2958    +29     
========================================
+ Hits        16256    16358   +102     
- Misses       1937     1944     +7     
- Partials      758      766     +8     

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[fmigneault]

@languith @Nazim-crim
Ready for review. Waiting on tech to update permissions to add you as reviewers.
Don't need an in-depth review, but feel free to ask questions.
Most of the code base received some tweaks since many endpoints are updated for the new HTML format.
Therefore, it is a good overview of capabilities and various parts of the code to familiarize yourselves.