"is" returns false if object is not a Ceylon type
throwexc, dynattrib, improve checks for isOfType
throwexc accepts native and Ceylon strings
attributes as JS properties (in progress)
Test for #197
String is no longer a sequence + covariantly refine rest
Merge branch 'properties'
eliminate duplicate definition of String.first
Util: added is method for reified type tests
Added types for reified types
WIP: TypeDescriptor: added static isObject method to test performance
Util: added method for reified tests for interop
TypeDescriptor: added member type support
Added static TD constants to each major native types
Updated runtime for reified generics
Added typechecker/compiler/cmr to classpath, now that the runtime depends on the model loader / typechecker model
Added a few missing @Ignore
ReifiedType.$is is replaced by ReifiedType.$getType
Float and Integer are ReifiedType
Float: removed obsolete castValue method