Support new API changes

There have been a number of API changes to support buckets. you can refer to this PR: https://github.com/waifuvault/waifuVault-node-api/pull/15

Buckets are temprry virtual buckets that are managed with a single token

here are the outline of the changes:

uploadFile now takes an optinal path paramater that is a token. when supplied. it will call /uploadFile/{token} this is the bucket token
the file info and upload response now returns a bucket prop that is nullable. if the file belongs to a bucket, the bucket token will be there
createBucket endpoint that is a GET and takes no body (buckets are created once per IP). the endpoint is /rest/bucket/create
deleteBucket endpoint a DELETE takes the bucxket token as a path param. the endpoint is /rest/bucket/${bucketToken}
getBucket endpoint, a POST to /rest/bucket/get that takes the the body of:
```
{
"bucket_token": "bucketToken"
}
```

the response of the get is an object with the shape of

"token": "string",
"files": FileResponseObject[]

where FileResponseObject is whatever type you have defined in the response of getFileInfo.

waifuvault / waifuVault-php-api