[MLS TRANSACTIONS] The Seattle Sounders signed 30-year-old Austrian goalkeeper Michael Gspurning as its replacement for the retiring Kasey Keller, and the Philadelphia Union acquired Costa Rican international Josue Martinez from Saprissa. Gspurning has beencapped three times by Austria and been one of the top goalies in Greece the past four seasons for Skoda Xanthi. Martinez, 21, has scored 18 tallies in 43 appearances for Saprissa and two goals in 11games for Costa Rica’s national team. For all the MLS offseason player movement …

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