IMT objects are now pickleable
Fixed a docstring
Merge pull request #146 from gem/imt-pickleable

IMT objects are now pickleable
Minor fix in the imt module
Moved the tests inside the package
Renamed a script
Merge pull request #147 from gem/move-tests

Moved the tests inside the package
Merge remote-tracking branch 'GEM/master' into rob-hazardlib