Several fixes for Ext 4.2
Fix JS error when assoc column is read-only
Fix a combobox crash
Fix for GridLiveSearch

Searching on an unlisted column would fail.
Fix artifact bbar in Form
Pass column editor config to form fields
Add float, decimal columns to Book
Migration clean-up
Mark master as 0.9
Fix security flaw related to grid filters

Also re-enable warning logging
Extend file upload example
Fix sorting by association

Records with no association set, were not shown.
Thanks Arman "arman000" Bostani.
Rewrite a few specs with mocha
Rewrite failing grid sorting specs
Rewrite grid search specs in Mocha
Less error-prone column persistence

Replace dedicated handling of resizing, hiding, and moving columns
around with submitting the complete column state to the server each
time.

Had to comment out cucumber test for that, due to that I gave up trying
to figure out how to correctly move columns around programmatically in
latest Ext JS. May add it later after rethinking the tests code
structure.
Make latest Gherkin happy
Update according to latest Core
Multi-column sorting in grid
Unchecked checkbox in Form gets saved as false

Used to erroneously be nil