Rebase and merge ion-11-encoding branch into master

[popematt]

Issue #, if available:

Description of changes:

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

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (0d0258c) 66.61% compared to head (0cfec04) 67.03%.

Files	Patch %	Lines
src/com/amazon/ion/impl/bin/IonEncoder_1_1.java	96.87%	4 Missing and 5 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #643      +/-   ##
============================================
+ Coverage     66.61%   67.03%   +0.41%     
- Complexity     5351     5459     +108     
============================================
  Files           158      159       +1     
  Lines         22670    22987     +317     
  Branches       4073     4117      +44     
============================================
+ Hits          15102    15409     +307     
- Misses         6295     6299       +4     
- Partials       1273     1279       +6     

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