add coverage/ to .gitignore

Produced by eg `istanbul cover grunt simplemocha`
Rewrite normalization tests, doesn't use UChar anymore
Export only normalization methods
Import Unicode 6.3.0 data
Generate new unicode data
Add development notes to README
Generate data table without string wrap
No more evil eval
Merge pull request #11 from phadej/refactor-tests

Refactor tests
Merge pull request #12 from phadej/unicode-6.3.0

Unicode 6.3.0
Merge pull request #13 from phadej/no-evil

No evil eval anymore
Nitpicking: Slash too much.
Releasing new version.