Documentation added in aaf034b on Nov 17th 2016 says the S3 bucket can
be specified with `s3.bucket`, but commit c8bcc4c (#285) on Dec 18th
2016 used `s3bucket`. Instead of fixing the code (#552) to match the
documentation this commit changes just the documentation so that
existing configurations are not broken. Also, the `s3` object is passed
as is to `AWS.S3()`, which does not know the option `bucket` (but
silently ignores it in my test).
http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#constructor-property
Following the old documentation leads to this exception:
2017-09-23T09:42:38.079Z - error: MissingRequiredParameter: Missing required key 'Bucket' in params
at ParamValidator.fail (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/param_validator.js:50:37)
at ParamValidator.validateStructure (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/param_validator.js:61:14)
at ParamValidator.validateMember (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/param_validator.js:88:21)
at ParamValidator.validate (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/param_validator.js:34:10)
at Request.VALIDATE_PARAMETERS (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/event_listeners.js:125:42)
at Request.callListeners (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
at callNextListener (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/sequential_executor.js:95:12)
at /srv/hackmd/hackmd/node_modules/aws-sdk/lib/event_listeners.js:85:9
at finish (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/config.js:315:7)
at /srv/hackmd/hackmd/node_modules/aws-sdk/lib/config.js:333:9
at Credentials.get (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/credentials.js:126:7)
at getAsyncCredentials (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/config.js:327:24)
at Config.getCredentials (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/config.js:347:9)
at Request.VALIDATE_CREDENTIALS (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/event_listeners.js:80:26)
at Request.callListeners (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/sequential_executor.js:101:18)
at Request.emit (/srv/hackmd/hackmd/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
