Rails upgrade 5 2

[mayerm94]

Upgrade to rails 5.2, remove usage of simplexml (cut ties with HDS)
Pull requests into cqm-parsers require the following. Submitter and reviewer should ✅ when done. For items that are not-applicable, note it's not-applicable ("N/A") and ✅.

Submitter:

• This pull request describes why these changes were made.
• Internal ticket for this PR: https://jira.mitre.org/browse/CYPRESS-461
• Internal ticket links to this PR
• Code diff has been done and been reviewed
• Tests are included and test edge cases
• Tests have been run locally and pass

Reviewer 1:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• The tests appropriately test the new code, including edge cases
• You have tried to break the code

Reviewer 2:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• The tests appropriately test the new code, including edge cases
• You have tried to break the code

[codecov-io]

Codecov Report

Merging #30 into master will decrease coverage by 3.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   85.63%   82.36%   -3.27%     
==========================================
  Files          69       69              
  Lines        4315     4315              
==========================================
- Hits         3695     3554     -141     
- Misses        620      761     +141

Impacted Files	Coverage Δ
...ers/dc_definition_from_template_or_type_extract.rb	60.78% <0%> (-23.53%)	⬇️
...rser/2.0/document_helpers/doc_population_helper.rb	78% <0%> (-19%)	⬇️
...ic_occurrences_and_source_data_criteria_extract.rb	73.33% <0%> (-16.67%)	⬇️
lib/hqmf-parser/2.0/precondition.rb	85.36% <0%> (-14.64%)	⬇️
lib/hqmf-parser/2.0/data_criteria.rb	81.69% <0%> (-13.15%)	⬇️
lib/hqmf-parser/2.0/types.rb	83.82% <0%> (-11.77%)	⬇️
lib/hqmf-model/types.rb	72.93% <0%> (-6.77%)	⬇️
.../hqmf-parser/2.0/document_helpers/doc_utilities.rb	94.11% <0%> (-5.89%)	⬇️
lib/hqmf-parser/2.0/population_criteria.rb	93.44% <0%> (-4.92%)	⬇️
lib/hqmf-model/data_criteria.rb	65.85% <0%> (-1.96%)	⬇️
... and 1 more

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