Add getRecommendedShards and automatic shard count in ShardingManager (#796)

* draft stuff

fix docstring for Client#token

Reorganise resolver

make env better for shards, clean up docs

Fix Gus' log messages

7

meh just gateway/bot not v7 :(

final changes, ready for mergin!

build docs

make default totalShards 'auto', fix docs for totalShards type

clean up docs more

run docs

* make consistancy real

* Update and rename getRecommendedShards.js to GetRecommendedShards.js

* Update GetRecommendedShards.js

* Update index.js

* Update RESTMethods.js

* Update Shard.js

* Update GetRecommendedShards.js

* Update ShardingManager.js

* run docs

src/index.js

@@ -8,6 +8,7 @@ module.exports = {
   Collection: require('./util/Collection'),
   splitMessage: require('./util/SplitMessage'),
   escapeMarkdown: require('./util/EscapeMarkdown'),
+  getRecommendedShards: require('./util/GetRecommendedShards'),
 
   Channel: require('./structures/Channel'),
   ClientUser: require('./structures/ClientUser'),