Fixes #656 Stop caching yarn dependencies to prevent build inconsistencies

[Frozenfire92]

This prevents Travis from caching to prevent build inconsistencies described in #656

[Frozenfire92]

Not entirely sure the reason why this is failing

https://travis-ci.org/Addepar/ember-table/jobs/491781352

Error: Could not import `@addepar/style-toolbox/utilities/global-functions/Utils` from any of the following locations:
  /home/travis/build/Addepar/ember-table/tmp/sass_compiler-input_base_path-kQMCF3XS.tmp/@addepar/style-toolbox/components/pop-menu/adde-tooltip/@addepar/style-toolbox/utilities/global-functions/Utils.scss
  /home/travis/build/Addepar/ember-table/tmp/sass_compiler-input_base_path-kQMCF3XS.tmp/@addepar/style-toolbox/components/pop-menu/adde-tooltip/@addepar/style-toolbox/utilities/global-functions/Utils.sass
  /home/travis/build/Addepar/ember-table/tmp/sass_compiler-input_base_path-kQMCF3XS.tmp/@addepar/style-toolbox/components/pop-menu/adde-tooltip/@addepar/style-toolbox/utilities/global-functions/_Utils.scss
  /home/travis/build/Addepar/ember-table/tmp/sass_compiler-input_base_path-kQMCF3XS.tmp/@addepar/style-toolbox/components/pop-menu/adde-tooltip/@addepar/style-toolbox/utilities/global-functions/_Utils.sass
  /home/travis/build/Addepar/ember-table/@addepar/style-toolbox/utilities/global-functions/Utils.scss
  /home/travis/build/Addepar/ember-table/@addepar/style-toolbox/utilities/global-functions/Utils.sass
  /home/travis/build/Addepar/ember-table/@addepar/style-toolbox/utilities/global-functions/_Utils.scss
  /home/travis/build/Addepar/ember-table/@addepar/style-toolbox/utilities/global-functions/_Utils.sass
  /home/travis/build/Addepar/ember-table/tmp/sass_compiler-input_base_path-kQMCF3XS.tmp/@addepar/style-toolbox/utilities/global-functions/Utils.scss
  /home/travis/build/Addepar/ember-table/tmp/sass_compiler-input_base_path-kQMCF3XS.tmp/@addepar/style-toolbox/utilities/global-functions/Utils.sass
  /home/travis/build/Addepar/ember-table/tmp/sass_compiler-input_base_path-kQMCF3XS.tmp/@addepar/style-toolbox/utilities/global-functions/_Utils.scss
  /home/travis/build/Addepar/ember-table/tmp/sass_compiler-input_base_path-kQMCF3XS.tmp/@addepar/style-toolbox/utilities/global-functions/_Utils.sass

not ok 1 Chrome 72.0 - [undefined ms] - Global error: Uncaught TypeError: Cannot read property 'prototype' of undefined at http://localhost:7357/assets/vendor.js, line 148305

not ok 2 Chrome 72.0 - [undefined ms] - Global error: Uncaught Error: Assertion Failed: The tests file was not loaded. Make sure your tests index.html includes "assets/tests.js". at http://localhost:7357/assets/vendor.js, line 52821

[cyk]

I think it's related to conflicting ember-data versions, specifically around its ember-set/ordered dependency.

See ember-learn/ember-cli-addon-docs#242, fixed in v0.6.0. Maybe worth trying a version bump for ember-cli-addon-docs (currently, ^0.5.0)?

[Frozenfire92]

nope, seemed to cause more of the travis jobs to fail by doing that

[cyril-sf]

There is a bug in Addepar/addepar-style-toolbox v0.5.5 that caused this problem.

This was fixed with #661