Switch to packaged index.html by default

Unpackaged is available in index_dev.html.
Change default max zoom to 20

A lot of imagery goes to z20 now. Where the max zoom is not known it should be set high to allow the imagery to be used at its maximum resolution

Where the source imagery does not support up to z20 it will fall back to higher zoom levels. It is unlikely that editors will be zoomed in far past the max zoom of the imagery.

This does not replace the lack of max zoom support for preset imagery layers (issue #784)
Update vi.js

64200b9
Merge pull request #944 from 1ec5/patch-1

Update vi.js
Merge pull request #928 from pnorman/patch-1

Change default max zoom to 20
Merge tags without a space, fixes #941
Add data makefile
Merge branch 'tags-semicolon'
new preset build script, order is not significant
score wildcard matches as half a match

so that building=* doesn't get prioritized over more
specific one tag presets, like amenity=hospital
use ui.Toggle for geocoder results
Add construction preset
Smarter tag conflict merging (fixes #943)
Avoid writing undefined properties in JSON localStorage
Merge branch 'master' of github.com:systemed/iD. Fixes #924
Fix overeager lookup. Fixes #907
Fix errors in deprecated.json. Fixes #933

This file is sourced from DeprecatedTags.java in JOSM
Merge branch 'package'

Conflicts:
	index.html
Add dimensions, improve make situation for presets.
Add build