Introduce "common year" (from wikipedia)

Guntbert Reiter · Guntbert Reiter · commit 04a181e8d706 · 2016-12-06T19:14:40.000+01:00
diff --git a/exercises/leap/canonical-data.json b/exercises/leap/canonical-data.json
@@ -1,7 +1,7 @@
 {
    "cases": [
       {
-         "description": "year not divisible by 4: not a leap year",
+         "description": "year not divisible by 4: common year",
          "input": 2015,
          "expected": false
       },
@@ -11,7 +11,7 @@
          "expected": true
       },
       {
-         "description": "year divisible by 100, not divisible by 400: not a leap year",
+         "description": "year divisible by 100, not divisible by 400: common year",
          "input": 2100,
          "expected": false
       },

Original file line number	Diff line number	Diff line change
`@@ -1,7 +1,7 @@`
`1`	`1`	`{`
`2`	`2`	`"cases": [`
`3`	`3`	`{`
`4`		`- "description": "year not divisible by 4: not a leap year",`
	`4`	`+ "description": "year not divisible by 4: common year",`
`5`	`5`	`"input": 2015,`
`6`	`6`	`"expected": false`
`7`	`7`	`},`
`@@ -11,7 +11,7 @@`
`11`	`11`	`"expected": true`
`12`	`12`	`},`
`13`	`13`	`{`
`14`		`- "description": "year divisible by 100, not divisible by 400: not a leap year",`
	`14`	`+ "description": "year divisible by 100, not divisible by 400: common year",`
`15`	`15`	`"input": 2100,`
`16`	`16`	`"expected": false`
`17`	`17`	`},`