Bump to v4.0.0.

collection.js

@@ -1,44 +1,28 @@
 module.exports = {
-  'all': require('./collection/all'),
-  'any': require('./collection/any'),
-  'at': require('./collection/at'),
-  'collect': require('./collection/collect'),
-  'contains': require('./collection/contains'),
-  'countBy': require('./collection/countBy'),
-  'detect': require('./collection/detect'),
-  'each': require('./collection/each'),
-  'eachRight': require('./collection/eachRight'),
-  'every': require('./collection/every'),
-  'filter': require('./collection/filter'),
-  'find': require('./collection/find'),
-  'findLast': require('./collection/findLast'),
-  'findWhere': require('./collection/findWhere'),
-  'foldl': require('./collection/foldl'),
-  'foldr': require('./collection/foldr'),
-  'forEach': require('./collection/forEach'),
-  'forEachRight': require('./collection/forEachRight'),
-  'groupBy': require('./collection/groupBy'),
-  'include': require('./collection/include'),
-  'includes': require('./collection/includes'),
-  'indexBy': require('./collection/indexBy'),
-  'inject': require('./collection/inject'),
-  'invoke': require('./collection/invoke'),
-  'map': require('./collection/map'),
-  'max': require('./math/max'),
-  'min': require('./math/min'),
-  'partition': require('./collection/partition'),
-  'pluck': require('./collection/pluck'),
-  'reduce': require('./collection/reduce'),
-  'reduceRight': require('./collection/reduceRight'),
-  'reject': require('./collection/reject'),
-  'sample': require('./collection/sample'),
-  'select': require('./collection/select'),
-  'shuffle': require('./collection/shuffle'),
-  'size': require('./collection/size'),
-  'some': require('./collection/some'),
-  'sortBy': require('./collection/sortBy'),
-  'sortByAll': require('./collection/sortByAll'),
-  'sortByOrder': require('./collection/sortByOrder'),
-  'sum': require('./math/sum'),
-  'where': require('./collection/where')
+  'at': require('./at'),
+  'countBy': require('./countBy'),
+  'each': require('./each'),
+  'eachRight': require('./eachRight'),
+  'every': require('./every'),
+  'filter': require('./filter'),
+  'find': require('./find'),
+  'findLast': require('./findLast'),
+  'forEach': require('./forEach'),
+  'forEachRight': require('./forEachRight'),
+  'groupBy': require('./groupBy'),
+  'includes': require('./includes'),
+  'invokeMap': require('./invokeMap'),
+  'keyBy': require('./keyBy'),
+  'map': require('./map'),
+  'orderBy': require('./orderBy'),
+  'partition': require('./partition'),
+  'reduce': require('./reduce'),
+  'reduceRight': require('./reduceRight'),
+  'reject': require('./reject'),
+  'sample': require('./sample'),
+  'sampleSize': require('./sampleSize'),
+  'shuffle': require('./shuffle'),
+  'size': require('./size'),
+  'some': require('./some'),
+  'sortBy': require('./sortBy')
 };