Added all math By snippets

tag_database

@@ -1,6 +1,7 @@
 anagrams:string,recursion
 arrayToHtmlList:browser,array
 average:math,array
+averageBy:math,array,function
 bottomVisible:browser
 byteSize:string
 call:adapter,function
@@ -102,9 +103,11 @@ lowercaseKeys:object
 luhnCheck:math,utility
 mapObject:array,object
 mask:string,utility,regexp
+maxBy:math,array,function
 maxN:array,math
 median:math,array
 memoize:function
+minBy:math,array,function
 minN:array,amth
 negate:function
 nthElement:array
@@ -158,6 +161,7 @@ splitLines:string
 spreadOver:adapter
 standardDeviation:math,array
 sum:math,array
+sumBy:math,array,function
 sumPower:math
 symmetricDifference:array,math
 tail:array