Merge pull request #557 from Chalarangelo/btoa

[FEATURE] btoa and atob

snippets/atob.md

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+### atob
+
+Decodes a string of data which has been encoded using base-64 encoding.
+
+Create a `Buffer` for the given string with base-64 encoding and use `Buffer.toString('binary')` to return the decoded string.
+
+```js
+const atob = str => new Buffer(str, 'base64').toString('binary');
+```
+
+```js
+atob('Zm9vYmFy'); // 'foobar'
+```

snippets/btoa.md

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+### btoa
+
+Creates a base-64 encoded ASCII string from a String object in which each character in the string is treated as a byte of binary data.
+
+Create a `Buffer` for the given string with binary encoding and use `Buffer.toString('base64')` to return the encoded string.
+
+```js
+const btoa = str => new Buffer(str, 'binary').toString('base64');
+```
+
+```js
+btoa('foobar'); // 'Zm9vYmFy'
+```