number sanitizing allows scientific expression
Fixes #186 Array item form disappears when second to last item is deleted
Merge branch 'mazswojejzony-master'
Start array title index at 1. Fixes #167

Add extra variables "i0" and "i1" to headerTemplate as well to enable switching back to the old behavior.
Merge branch 'sanitize_number' of https://github.com/xeno1991/json-editor into xeno1991-sanitize_number
Merge branch 'xeno1991-sanitize_number'
Bump version number to 0.7.2