Return a variable name from given string
See also: to-class-name
$ npm install variable-name
variableName = require('variable-name')
variableName('hello world')
// => helloWorld
It anglicizes special characters automatically;
variableName('testing âçığöşüñ and ÂÇİĞÖŞÜÑ');
// => testingAcigosunAndAcigosun