v1.5.6

• Add missed ext property in onBeforeUpload callback
• Fix #88
• Fix #89
• Fix exception when localStorage is not accessible
• Server methods: .write(), .load(), .addFile() now works with
  omitted second argument
• Clean up old unused code
• Fix issue with chunks order
• Stability enhancements in .remove() method

Demo app:

• Minor code enhancements
• Add “blame/abuse” option, as some uploaded images was inappropriate
• Add remove button example (see in code)