Minor changes to see what happen with the tests
Changes in the query builder for the treatment of the scopes. By now, we make it manually.
Model for analytics created. We have implemented all the basics to run an example analytic algorithm in backend
Added a no-minified version of Sigma.js. Also this version don't cause failures on Travis-CI.
More changes in query builder to release it. We have changed the name analytics for analysis in the engines-gdb.
Merge branch 'develop' of https://github.com/CulturePlex/Sylva into devel

Merge pull request from develop branch.
Changes in the query builder to improve the queries with dates. Commented the line for import celery in neo4j.py to solve test problems.
fixed the enable conflicts