Greek tokenization errors

[balmas]

Reported by @nevenjovanovic in alpheios-project/arethusa#631

καί ποτε τοῦ Σοφοκλέους, ὅτε συστρατηγῶν ἐξέπλευσε μετ᾽ αὐτοῦ, παῖδα καλὸν ἐπαινέσαντος, ‛οὐ μόνον,’ ἔφη, ‛τὰς χεῖρας, ὦ Σοφόκλεις, δεῖ καθαρὰς ἔχειν τὸν στρατηγόν, ἀλλὰ καὶ τὰς ὄψεις.’
-- in tokenizing, the opening quotation marks in ‛οὐ and ‛τὰς don't get separated from the words (single ' as well as double ").

The same goes for em dash - the following passage from Plato's Alcibiades 104a is not tokenized correctly: ... κάλλιστός τε καὶ μέγιστος—καὶ τοῦτο μὲν δὴ παντὶ δῆλον ἰδεῖν ὅτι οὐ ψεύδῃ—ἔπειτα νεανικωτάτου...; I am offered μέγιστος—καὶ and ψεύδῃ—ἔπειτα as single words.