string-pad

String LEFT/RIGHT/MIDDLE Pad
-----------------------------------
How to fuck a powerful interest group?
just push infinite blocks to his hole.

##Engines
greater that Node v4.X.X

##Example
``javascript
var pad = new stringPad('zhang', 11, '-');
console.log(pad.toLeft());
console.log(pad.toRight());
console.log(pad.toMiddle());

// -------zhang
// zhang-------
// zh-------ang
``