use yarn for Travis CI and Heroku

[codecov-io]

Current coverage is 43.77% (diff: 100%)

Merging #214 into master will not change coverage

@@             master       #214   diff @@
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  Files            34         34          
  Lines          1430       1430          
  Methods         193        193          
  Messages          0          0          
  Branches        170        170          
==========================================
  Hits            626        626          
  Misses          804        804          
  Partials          0          0          

Powered by Codecov. Last update 5fb9518...76570f1

[coveralls]

Coverage remained the same at 46.886% when pulling ea29d673adbc056c937b9a765fa062e657d858b0 on yarn into aa88c3b4e07578fb53ad676bdb343513b6216411 on master.

[coveralls]

Coverage remained the same at 46.886% when pulling fe18addaf9eb6f7b95f383103fdf86ab2f27a391 on yarn into dbfe2bc2a4627264205ea0057c953ec000e39f6b on master.

[coveralls]

Coverage remained the same at 46.844% when pulling 1f5a453df32792ae9d342330f0b91831c7e05119 on yarn into 1fe814344ab12d971eab01809f66aee8563303a0 on master.

[coveralls]

Coverage remained the same at 46.844% when pulling 658f30e3840a49ce8bebc1474964740673ecd87f on yarn into b981e72f4ea82708fd4340dc6263c0638ee2b35f on master.

[coveralls]

Coverage remained the same at 46.844% when pulling ac0e7b744a64053b8cbefc12e69f8708ccacb077 on yarn into b981e72f4ea82708fd4340dc6263c0638ee2b35f on master.

[coveralls]

Coverage remained the same at 46.844% when pulling c179463a298c39313b79ab65b586d9bf9863b637 on yarn into b981e72f4ea82708fd4340dc6263c0638ee2b35f on master.

[mvillis]

Yarn seems to be all the rage these days!

[rloomans]

It works well... Mostly.

When it works well, it can be massively faster..

Its very i/o intensive, so it completely hammers a VM or spinning disk.

[coveralls]

Coverage remained the same at 46.844% when pulling 6c706b8d249757d92ebcebbd1d95e581ffbc64fb on yarn into 6d8fa92fef425fbab6af71f920eade8777a960ff on master.

[coveralls]

Coverage remained the same at 46.844% when pulling b007eb0865270fc6469522074db38c8ac22fdade on yarn into 6d8fa92fef425fbab6af71f920eade8777a960ff on master.

[coveralls]

Coverage remained the same at 49.958% when pulling 1d658b364ef5ad55b409b0c22ae233d352729fa0 on yarn into 9c49c658f901b2d7cc6b94d86c83e6e21dc45ea7 on master.

[coveralls]

Coverage remained the same at 49.958% when pulling 90c196958247f3bc25f58838cdc64c8fa4b89395 on yarn into 47809d26a9ee6f7082707a778c62cf16da371904 on master.

[coveralls]

Coverage remained the same at 50.252% when pulling b419d938a55526b1b545a540bfb3a0b140a8092f on yarn into c8c2cee19fb900cda1cf88ddc2673d0445f07644 on master.

[coveralls]

Coverage remained the same at 50.252% when pulling 6500420c65c815394bb87cbda17d1195211252f4 on yarn into 1e8b0ded034ee2f8ec0f3db24e0e82e4a891401c on master.

[coveralls]

Coverage remained the same at 50.252% when pulling 655d375f673553fd50c68be9ce7c9e78cb50aab6 on yarn into 1e8b0ded034ee2f8ec0f3db24e0e82e4a891401c on master.

[coveralls]

Changes Unknown when pulling 3b63642143f0544bdd3d1c76421ce70ece4e6ed4 on yarn into on master.

[coveralls]

Coverage remained the same at 50.252% when pulling 3b63642143f0544bdd3d1c76421ce70ece4e6ed4 on yarn into 50735729348b89c3728703e7e30687cf93e3a36d on master.

[coveralls]

Coverage remained the same at 50.252% when pulling fa14902b631d9ce5f9bc6888882546affcf71cb2 on yarn into 9338e5cb9e06fced8e69521387394f222b077ef8 on master.

[coveralls]

Coverage remained the same at 50.252% when pulling ef96c215d9bae6d3c74421547bff0642bd87da2e on yarn into 01f0cfecd63218e4508ae7aede55b0b95c41ecb7 on master.

[coveralls]

Coverage remained the same at 50.252% when pulling 44191a9e6261e76a206aa0d71e6f164b887206e8 on yarn into 79b15a3399bb3414beeadb802e15b15b5d480a4d on master.

[coveralls]

Coverage remained the same at 50.252% when pulling aa77e24a2b6e6a377930930e9be1b8112c3c7198 on yarn into a2bf043a28d6ceaaf5c56032829ce912f1b723f5 on master.

[coveralls]

Changes Unknown when pulling 2c8551713bed7fc47137c3a3682c574deb74924e on yarn into on master.

[coveralls]

Coverage remained the same at 50.252% when pulling 76570f1a30373e06320fee27c9d4f84365f4daef on yarn into 5fb95188b8f8a20d481d1d8512db762447ae194c on master.