demos/risk:

Added classical BCR risk demo.
job/validation:

Added missing `export_dir` param to risk calc validation configs.
demos/risk:

Added CPSHA demo pack.
demos/risk:

Added probabilistic event-based demo pack.
demos/risk:

Added scenario and scenario_damage demos.
Implemented automagic block_size
Fixed a QA test
Merged from master
Merge branch 'master' into smart-block_size
demos/risk:

Renamed hazard and risk job.ini files to be more consistent.
Fixed some points raised in https://github.com/gem/oq-engine/pull/1189
demos/risk:

Renamed risk demo folders to have better and more descriptive names.

This is also more consistent with the naming style of the hazard demos.
Merge pull request #1189 from gem/better-instrument-hg

Added better instrumentation to the hazard getters
demos/scenario_damage_risk:

Removed an unused risk demo pack.
demos/risk/Scenario/README.txt:

Added a brief README for the Scenario risk demo pack.
Merge branch 'master' into smart-block_size
Splitted calc_num_tasks for event based an other calculators
Minor fix
Added a sanity check to make sure that the stored num_tasks is correct
first implementation