Add support for NSDictionary to NSFastEnumeration-only methods

[robb]

Consider methods that operate only on id<NSFastEnumeration> such as ASTAll

ASTAll(@{ @"key": @"value" }, someTest);

This will actually evaluate @"key" rather than @"value", which is probably more desired. However, if we add

BOOL ASTAll(NSDictionary *dict, BOOL(^block)(id value));

later, this may lead to some nasty surprises. Better to pre-empt that now and add dictionary versions that call the existing ones with allValues.

Affects

• [x] ASTAll
• [x] ASTAny
• [x] ASTGroupBy
• [x] ASTIndexBy
• [x] ASTMin
• [x] ASTMax
• [x] ASTPluck
• [x] ASTReduce