The ng::word_at function would not extend selection to full word

This would affect the buffer completion, which would work sub-optimally when selecting part of the word for replacement.
GitHub releases API is no longer in preview
Empty delta bundle items no longer result in a file on disk

For example if the user makes a change and later reverts it (in the bundle editor) there should no longer be a local (delta) item saved. Though the containing delta bundle remains (but ideally that should be removed as well).
Do not pass -fobjc-default-synthesize-properties to clang

This option was removed in revision 191551 of clang (Sep 27, 2013).

Property synthesizing seems to now be default, it’s unclear to me what revision of clang made the behavior default, but since we require a fairly recent version for other things (like Cap’n’proto) I don’t think this change will cause a problem.