remove corsproxy

Hey,

I tried to use your library, but it is returning a fatal error, maybe cause the query is not properly sanitized.

Here is an example to reproduce it: https://gist.github.com/ericsaboia/24b12a4e8d18592c3159#file-youtube_search_example-js

The stack trace:

```
Error: Unquoted attribute value
Line: 1
Column: 12
Char: e
    at error (/youtube-search/node_modules/xml2js/node_modules/sax/lib/sax.js:642:8)
    at strictFail (/youtube-search/node_modules/xml2js/node_modules/sax/lib/sax.js:662:22)
    at Object.write (/youtube-search/node_modules/xml2js/node_modules/sax/lib/sax.js:1240:11)
    at Parser.exports.Parser.Parser.parseString (/youtube-search/node_modules/xml2js/lib/xml2js.js:273:29)
    at Parser.parseString (/youtube-search/node_modules/xml2js/lib/xml2js.js:6:61)
    at exports.parseString (/youtube-search/node_modules/xml2js/lib/xml2js.js:296:19)
    at IncomingMessage.<anonymous> (/youtube-search/index.js:36:7)
    at IncomingMessage.EventEmitter.emit (events.js:117:20)
    at _stream_readable.js:920:16
    at process._tickDomainCallback (node.js:459:13)
```

And the http response:

```
<!DOCTYPE html>
<html lang=en>
  <meta charset=utf-8>
  <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width">
  <title>Error 400 (Bad Request)!!1</title>
  <style>
    *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}#logo{background:url(//www.google.com/images/errors/logo_sm_2.png) no-repeat}@media only screen and (min-resolution:192dpi){#logo{background:url(//www.google.com/images/errors/logo_sm_2_hr.png) no-repeat 0% 0%/100% 100%;-moz-border-image:url(//www.google.com/images/errors/logo_sm_2_hr.png) 0}}@media only screen and (-webkit-min-device-pixel-ratio:2){#logo{background:url(//www.google.com/images/errors/logo_sm_2_hr.png) no-repeat;-webkit-background-size:100% 100%}}#logo{display:inline-block;height:55px;width:150px}
  </style>
  <a href=//www.google.com/><span id=logo aria-label=Google></span></a>
  <p><b>400.</b> <ins>That’s an error.</ins>
  <p>Your client has issued a malformed or illegal request.  <ins>That’s all we know.</ins>
```

So I removed the **corsproxy** (not just because of the bug, but there is no need to use it anyway) and fired the request directly to youtube api. Now everything is working fine.