Added percent filter

Issue #84

Author: freearhey

src/other/index.js

@@ -3,11 +3,13 @@ import bytes from './bytes'
 import pluralize from './pluralize'
 import ordinal from './ordinal'
 import number from './number'
+import percent from './percent'
 
 export {
   currency,
   bytes,
   pluralize,
   ordinal,
-  number
+  number,
+  percent
 }

src/other/percent.js

@@ -0,0 +1,25 @@
+import util from '../util/index'
+
+/**
+ * 12               => '12%'
+ * 100              => '100%'
+ * 1000             => '1000%'
+ * 0.97             => '97%'
+ *
+ * @param {Number} value
+ * @param {Number} decimals Decimal places (default: 2)
+ */
+function percent(value, decimals) {
+    const globalOptions = (this && this.percent) ? this.percent : {}
+    decimals = util.exist(decimals) ? decimals : globalOptions.decimalDigits
+    decimals = (typeof decimals !== 'undefined') ? decimals : 0
+    value = value === null || isNaN(value) ? 0 : value
+    
+    if(value <= 1) {
+        return `${(value * 100).toFixed(decimals)}%`
+    }
+    
+    return `${value.toFixed(decimals)}%`
+}
+
+export default percent