Specify mode for creating cache directory
Move joblib.Memory instance to constants
Add marbl property to Node
Use custom hash for joblib.Memory
Fix static path for docs
Nitpicking
Use customizations to RTD theme
Build docs on grunt docs
Add Mechanism class
Use Mechanism in null concept
Move concept and constellation to compute
Fix Mechanism __new__ args
Update big_phi tests
joblib handles cachedir creation already
Add travis config