Default to post author if post editor is missing

Fixes #100
Don't fill link labels or headers

Fixes #97
Fixes #92.  Change default filter from `'none` to `'(())`.
Merge pull request #106 from jleechpe/issue-92

Fixes #92.  Change default filter from `'none` to `'(())`.
Finish partial fix.
Use customizable deleted-user structure
Make site a url argument

This addresses the apparent api bug which affected both the retrieval of
favorites and the site-switching. Se #82

As far as I can see, this issue affects ALL api calls, so it seems
reasonable that it should be fixed inside `sx-method-call`.

The usage of sx-method-call stays the same, only the internal has changed.
Don't do this patch when POSTing
Enforce string value for display_name
Add missing ')'

Staged only part of a change -- stupid mistake.
Function quote sx-request-make
Delete stack-exchange.el
Deleted-user variable is not risky
Merge branch 'master' into issue-100
Fix #112
Fix #114
Fix #110
Remove outdated resources
Fix #111
Prune unused lexical variable