ExpressionVisitor should throw with better messages

[vicb]

<p ng-repeat="i in [1,2] trak by $id">{{ i }}</p>

would throw

Bad state: Can not watch expression containing ';'.

STACKTRACE:
#0      ExpressionVisitor._notSupported (package:angular/core/scope.dart:1094:5)
#1      ExpressionVisitor.visitChain (package:angular/core/scope.dart:1090:18)
#2      Chain.accept (package:angular/core/parser/syntax.dart:73:48)
#3      DynamicExpression.accept (package:angular/core/parser/dynamic_parser.dart:46:48)
#4      ExpressionVisitor.visit (package:angular/core/scope.dart:984:15)
#5      ExpressionVisitor.visitCollection (package:angular/core/scope.dart:993:65)
#6      _AstParser.call (package:angular/core/scope.dart:968:51)
#7      _AstParser.call (package:angular/core/scope.dart:969:7)
#8      _AstParser.call (package:angular/core/scope.dart:969:7)
#9      Scope.watch (package:angular/core/scope.dart:228:35)

I've noticed this message in several different situation. We should give a better explanation of the issue.

[vsavkin]

May I try this?

[vicb]

That would be great, Victor!

[vsavkin]

PR: #905

I looked at AngularJS to see how it addresses this issue, and it does by throwing an error in the parser. So I did it in the same way.