add camelize and decamelize.

snippets/camelize.md

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+### Camelize
+
+Camelize a string, cutting the string by multiple separators like
+ hyphens, underscores and spaces.
+
+```js
+/**
+ * @param {str} string str to camelize
+ * @return string Camelized text
+ */
+const camelize = str => str.replace(/^([A-Z])|[\s-_]+(\w)/g, 
+  (match, p1, p2, offset) =>  p2 ? p2.toUpperCase() : p1.toLowerCase());
+// camelize("some_database_field_name") -> 'someDatabaseFieldName'
+// camelize("Some label that needs to be camelized") -> 'someLabelThatNeedsToBeCamelized'
+// camelize("some-javascript-property") -> 'someJavascriptProperty'
+// camelize("some-mixed_string with spaces_underscores-and-hyphens") -> 'someMixedStringWithSpacesUnderscoresAndHyphens'
+```

snippets/decamelize.md

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+### decamelize
+
+Decamelizes a string with/without a custom separator (underscore by default).
+
+```js
+const decamelize = (str, separator) => {
+  separator = typeof separator === 'undefined' ? '_' : separator;
+  return str
+        .replace(/([a-z\d])([A-Z])/g, '$1' + separator + '$2')
+        .replace(/([A-Z]+)([A-Z][a-z\d]+)/g, '$1' + separator + '$2')
+        .toLowerCase();
+}
+// decamelize('someDatabaseFieldName', ' ') -> 'some database field name'
+// decamelize('someLabelThatNeedsToBeCamelized', '-') -> 'some-label-that-needs-to-be-camelized'
+// decamelize('someJavascriptProperty', '_') -> 'some_javascript_property'
+```