More comprehensive property sort order error messages

[bitspook]

The error message for sorting with scss-lint.rb tells the entire sort-order, i.e it should be sorted prop1, prop2, prop3.

scss-lint.js says "expected prop1 found prop3" and on fixing this and rerunning it would say "expecting prop1 found prop2". It's sort of time consuming.

Would be nice if it could tell the entire sort order applicable for a given block of code.

cc: @gajus

[gajus]

Related:

• Allow empty entries in property-sort-order declaration indicating visual separation of property blocks #414
• property-sort-order: allow sorting by groups of rules #350

[rafw87]

I've prepared a PR which should provide better messages for the most common cases: #1157