added equality method for contexts objects
updated check_gsim script to check that context objects are not changed after calling get_mean_and_stddevs
fixed AB2003 and Zhao2006 and updated verification tables to reveal the bug
fix same error for two other GMPEs (AB1995 and Frankel1996)
AkB2010 extended and adjusted for use in the new Swiss Hazard model [2014]
AkB2010 reviewed. a new coefficients class added
AkB2010 reviewed. a new coefficients class added, pep8 verified
AkB2010 reviewed. a new coefficients class added, pep8 verified, removed print statemenet
AB2010_test reviewed, deleted non-used tables
AB2010_test reviewed, deleted non-used tables
AkB2010Swiss 2nd-review of the main class and tests
AkB2010Swiss 2nd-review, new utility class added, pep8 clean
AkB2010Swiss 3nd-review, new utility class added, pep8 clean
AkB2010Swiss 4th review, added units and tau flags
AkB2010Swiss --removed mean_phi_ss classes - ready for OQ
AkB2010Swiss --removed mean_phi_ss classes - ready for OQ
AkB2010Swiss --add corrected doc - ready for OQ
AkB2010Swiss --corrected coeff class - ready for OQ?
AkB2010Swiss --removed indentation
merged latest master