Small improvements to make the SourceCollector more usable from the command line
Big refactoring of the SourceCollector
Fixed a docstring
Merge pull request #11 from gem/split-by-trt

Many improvements to make the SourceCollector more usable from the command-line
Revisited the tests for the GMPE logic tree processor
Fixed the issue of non-contributing TRTs
Fixed a subtle ordering bug
Fixed an assertion
Fixed the test for two branchsets in the same branching level
Removed non-interesting tests
Reworded an error message
Merge pull request #13 from gem/gmpe_logic_tree_test

GMPE logic tree fix