Simvastatin Recruiting Phase 2 Trials for Stage IB Breast Cancer AJCC v7 / Invasive Breast Carcinoma / Stage IIA Breast Cancer AJCC v6 and v7 / Stage II Breast Cancer AJCC v6 and v7 / Stage IIB Breast Cancer AJCC v6 and v7 / Stage I Breast Cancer AJCC v7 / Stage IA Breast Cancer AJCC v7 Treatment