Rename "to_json" to avoid collisions with built-in methods

[legal90]

Fixes #474 Closes #475

We need to rename the method to_json in order to avoid collisions with Chef built-in methods having the same name.

cc @gdavison, @Wing924

[codecov-io]

Codecov Report

Merging #476 into master will decrease coverage by 5.04%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #476      +/-   ##
==========================================
- Coverage   71.51%   66.46%   -5.05%     
==========================================
  Files           7        7              
  Lines         337      337              
==========================================
- Hits          241      224      -17     
- Misses         96      113      +17

Impacted Files	Coverage Δ
libraries/consul_watch.rb	90.9% <100%> (+42.42%)	:arrow_up:
libraries/consul_definition.rb	44.44% <50%> (ø)	:arrow_up:
libraries/consul_config.rb	80.29% <50%> (-17.52%)	:arrow_down:
libraries/consul_execute.rb	55% <0%> (-45%)	:arrow_down:
libraries/helpers.rb	65.21% <0%> (+8.69%)	:arrow_up:

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