removed  so that jb-based distance method in super class is used instead
updated tests
removed reference to PointSource.filter_sites_by_distance_to_rupture
Merge pull request #141 from monellid/fix-rup-filter2

Fix rupture-sites distance filtering for point and area sources
Initial code implementation (no tests)
Full implementation of Lin (2009) GMPE
Adds Lin (2009) Adjusted Sigma to doc-string
Added the RotD50 horizontal component
Fixes required rupture parameters comment
Merge pull request #143 from g-weatherill/lin_2009_gmpe

Implements Lin (2009) GMPE for Active Shallow Faults in Taiwan
Merge pull request #144 from vup1120/master

Added the RotD50 horizontal component
Fixes header in Lin (2009) doc
Merge pull request #145 from g-weatherill/lin_2009_gmpe

Fixes header in Lin (2009) doc
Merge remote-tracking branch 'GEM/master' into rob-hazardlib
Merge remote-tracking branch 'ROB/rob-hazardlib' into rob-hazardlib