Update travis status in README
Enhance normal map spec
Correct InferenceSepc to InferenceSpec
Implement map fusion
Start work on constant folding
Remove travis button
Adapt comments for constant folding
Add StaticSignal creation to DSL
Add constat class to rescala
Constant folding for StaticSignal
Enable transitive constant folding
Constant Folding for syntactic signals
Add fibonacci ops to DSL
Include example with comparison of fibonacci map fusion
Remove some explicit type annotations
Add map fusion test with intermediate assignments
Basic traits for sig expr fusion
Insert TODOs
Start SigExprFusionSpec

investigate Transformers
mirror for SigApplyDep and VarCreation