MongoDB short id

Create shorter string from MongoDB objectIDs and reverse

Api Examples

``javascript
var shortID = require('mongodb-short-id');

shortID.longToShort('507f1f77bcf86cd799439011');
// => 'UH8fd7z4bNeZQ5AR'

shortID.shortToLong('UH8fd7z4bNeZQ5AR');
// => '507f1f77bcf86cd799439011'

shortID.shortToObjectID('UH8fd7z4bNeZQ5AR');
// => 507f1f77bcf86cd799439011
typeof shortID.shortToObjectID('UH8fd7z4bNeZQ5AR');
// => 'object'

var objectID = shortID.shortToObjectID('UH8fd7z4bNeZQ5AR');
shortID.objectIDToShort(objectID)
// => 'UH8fd7z4bNeZQ5AR'
`

$3

* l2s => longToShort
* s2l => shortToLong
* o2s => objectIDtoShort
* s2o => shortToObjectID`

$3

* master: 
* develop: