Adding delimiter between the hash data components.

[praneetap]

Issue #, if available:
#191
Description of changes:
Adding a delimiter between the hash components as best practice.
Description of how you validated changes:
make pr
Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jlhood]

Was expecting to see updates to the output files as well. This should change the hash values on the existing tests, right?

[jlhood]

Code looks good. Just waiting for updating test output files, then I'll approve.

[keetonian]

Approved provided travis passes.

[codecov-io]

Codecov Report

Merging #1060 into develop will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1060      +/-   ##
===========================================
+ Coverage    94.92%   94.93%   +<.01%     
===========================================
  Files           69       69              
  Lines         3253     3255       +2     
  Branches       633      633              
===========================================
+ Hits          3088     3090       +2     
  Misses          87       87              
  Partials        78       78

Impacted Files	Coverage Δ
samtranslator/model/apigateway.py	97.79% <100%> (+0.02%)	⬆️

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