Upgrade UnicodeJS to Unicode 6.3 spec

*properties.js files generated from unicodejs-properties.py

* Added Hebrew_Letter, Single_Quote & Double_Quote to wordbreak
  plus a few rules around them.
* Added verbose documentation to grapheme break to assist in
  future upgrades.
* Update script to comment files as generated.

Change-Id: I7a4729d084073ea2af1b912dd3f6f52614076d3d
Merge "Upgrade UnicodeJS to Unicode 6.3 spec"