Show actual exception stack trace when 'throw' assertion fails.

The output looks like the following:

AssertionError: function () { [native code] } must throw /_types/ but
threw
Error: use valid cql types while declaring columns in TABLE
Error
at FluentCql.setError (C:\code\fcql\lib\fluent-cql.js:63:43)
at FluentCql._columns (C:\code\fcql\lib\fluent-cql.js:388:25)
at FluentCql._table (C:\code\fcql\lib\fluent-cql.js:360:81)
at FluentCql.table (C:\code\fcql\lib\fluent-cql.js:343:38)
at C:\code\fcql\lib\builder.js:17:29
at ...