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)
Provide a meaningful error message when a correlation model is provided together with a GMPE without inter/intra stddevs
Add "contributors" file
Add test run instructions to README
Merge pull request #213 from larsbutler/README-test-run-instructions

Add test run instructions to README
Merge pull request #212 from larsbutler/contributors-file

Add "contributors" file
AkB2010 extended and adjusted for use in the new Swiss Hazard model [2014]
experimental commit to check new package publishing strategy
split monotone directory in binaries and sources
add flag -S to copy sources to <GEM_DEB_MONOTONE>/sources
monotone: renamed subdirs to singular
extend SiteContext to accept also sites coordinates (lons and lats)
Add tox.ini config for easy test running
Merge pull request #221 from monellid/extend_site_context

extend SiteContext to accept also sites coordinates (lons and lats)
Merge pull request #211 from gem/correlation-no-inter-intra

Provide a meaningful error message when a correlation model is provided together with a GMPE without inter/intra stddevs
Added a test for the distance to arc
Added a method called distance_to_semi_arc