Handle christmas <-> christmases (#83)

pluralize.js

@@ -330,9 +330,9 @@
     [/[^\u0000-\u007F]$/i, '$0'],
     [/([^aeiou]ese)$/i, '$1'],
     [/(ax|test)is$/i, '$1es'],
-    [/(alias|[^aou]us|tlas|gas|ris)$/i, '$1es'],
+    [/(alias|[^aou]us|t[lm]as|gas|ris)$/i, '$1es'],
     [/(e[mn]u)s?$/i, '$1s'],
-    [/([^l]ias|[aeiou]las|[emjzr]as|[iu]am)$/i, '$1'],
+    [/([^l]ias|[aeiou]las|[ejzr]as|[iu]am)$/i, '$1'],
     [/(alumn|syllab|octop|vir|radi|nucle|fung|cact|stimul|termin|bacill|foc|uter|loc|strat)(?:us|i)$/i, '$1i'],
     [/(alumn|alg|vertebr)(?:a|ae)$/i, '$1ae'],
     [/(seraph|cherub)(?:im)?$/i, '$1im'],
@@ -368,7 +368,7 @@
     [/\b(mon|smil)ies$/i, '$1ey'],
     [/(m|l)ice$/i, '$1ouse'],
     [/(seraph|cherub)im$/i, '$1'],
-    [/(x|ch|ss|sh|zz|tto|go|cho|alias|[^aou]us|tlas|gas|(?:her|at|gr)o|ris)(?:es)?$/i, '$1'],
+    [/(x|ch|ss|sh|zz|tto|go|cho|alias|[^aou]us|t[lm]as|gas|(?:her|at|gr)o|ris)(?:es)?$/i, '$1'],
     [/(analy|ba|diagno|parenthe|progno|synop|the|empha|cri)(?:sis|ses)$/i, '$1sis'],
     [/(movie|twelve|abuse|e[mn]u)s$/i, '$1'],
     [/(test)(?:is|es)$/i, '$1is'],

test.js

@@ -332,6 +332,8 @@ var BASIC_TESTS = [
   ['sun', 'suns'],
   ['drink', 'drinks'],
   ['diploma', 'diplomas'],
+  ['dilemma', 'dilemmas'],
+  ['grandma', 'grandmas'],
   ['no', 'nos'],
   ['yes', 'yeses'],
   ['employ', 'employs'],
@@ -589,6 +591,8 @@ var BASIC_TESTS = [
   ['crispness', 'crispnesses'],
   ['racehorse', 'racehorses'],
   ['greatness', 'greatnesses'],
+  ['christmas', 'christmases'],
+  ['zymase', 'zymases'],
   // Prototype inheritance.
   ['constructor', 'constructors'],
   // Non-standard case.