Trastuzumab Recruiting Phase 2 Trials for Stage IIIA Colon Cancer AJCC v7 / Stage IVB Rectal Cancer AJCC v7 / Recurrent Rectal Carcinoma / Stage IIIA Rectal Cancer AJCC v7 / Stage III Rectal Cancer AJCC v7 / Stage IVA Colon Cancer AJCC v7 / ERBB2 Gene Amplification / Stage IV Rectal Cancer AJCC v7 / Stage IIIB Rectal Cancer AJCC v7 / Stage IVA Rectal Cancer AJCC v7 / Stage IV Colon Cancer AJCC v7 / Stage IVB Colon Cancer AJCC v7 / Colon Adenocarcinoma / Rectal Adenocarcinoma / Stage IIIB Colon Cancer AJCC v7 / Stage IIIC Rectal Cancer AJCC v7 / Stage IIIC Colon Cancer AJCC v7 / Stage III Colon Cancer AJCC v7 / Recurrent Colon Carcinoma Treatment