File option

Added support for file options.

```Resumable.setFileOptions``` - options for files to inherit
```Resumable.setOptions (and construct + default options)``` fallback when fileOption is not defined. Does not overrides setFileOptions.
```fileObject.getOpt('name');``` gets options (file option, fallback to Resumable object option)



Except folowing options, which have no use to bind to file object
```
generateUniqueIdentifier
maxFiles
maxFilesErrorCallback
simultaneousUploads
prioritizeFirstAndLastChunk
```

Experiment showing use in added sample.

Also some minor fixes.