Merge pull request #52 from charlotte-raillere/rc2_dev

Metacore Enrichment Analysis + MongoDB file storage + Fixes
To execute the callback when subset is not empty and has result instance id.
Merge pull request #57 from thehyve/issues/heatmap_stop_run_rc2_dev

Issues/heatmap stop run rc2 dev
Fix export problem when filtering on the first column
Fix clear Metacore box
Merge remote-tracking branch 'upstream/rc2_dev' into rc2_dev