Study of B-+/--> J/psi pi(+/-) and B-+/--> J/psi K-+/- decays: Measurement of the ratio of branching fractions and search for direct CP-violating charge asymmetries RID C-2728-2008 RID C-5223-2009 RID C-5719-2008 RID A-8865-2012 RID D-1189-2011 RID A-2675-2009