Implement test with multiple different root tables

[Joakim Hassila]

Would be good to verify, should be possible: [(http://stackoverflow.com/questions/35937976/multiple-root-tables-in-flatbuffers)]

[Joakim Hassila]

IIUC, we should codegen

    public static func fromByteArray(data : UnsafeBufferPointer<UInt8>, config : BinaryReadConfig = BinaryReadConfig()) -> T
    public static func fromRawMemory(data : UnsafeMutablePointer<UInt8>, count : Int, config : BinaryReadConfig = BinaryReadConfig()) -> T

for all tables, not only the declared root one?

[Maxim Zaks]

I am not sure it is a good idea because it interferes with file_identifier I guess #48 is a better solution where you can specify different root_type corresponding to different file_identifier

[Joakim Hassila]

#48 solves a slightly different problem - the ability to merge multiple schemas - this case was about being able to decode i.e. FoobarContainer or Foobar with the classes that were in this case in the same file.

The use case is e..g. when you get multiple different messages sent to you over a network connection, it works to define each in a separate .fbs, but perhaps a bit cumbersome. I could live with #48 though.