Simobject 20160927

Created  a simulation object and a handful of tests. More tests will be needed, and sanitizing will  strongly depend on the input data format, which is not yet completely defined. A test config.json file was added to allow test database integration, and config.js was adapted to choose config file from context.

Files added:
src/libs/models/simulation.js - mongo schema for simulation;
src/libs/routes/simulation.js - express controller for simulation api.

See merge request !23