remove useless experiment json files

...tage3/train+dev,train+dev/boston_train+dev,train+dev.json

...dev,train+dev/boston_train+dev,train+dev_normalize-D.json

...rain+dev,train+dev_normalize-D_weights-normalization.json

...dev/boston_train+dev,train+dev_weights-normalization.json

experiments/boston/stage3/train,dev/boston_train,dev.json

...boston/stage3/train,dev/boston_train,dev_normalize-D.json

...v/boston_train,dev_normalize-D_weights-normalization.json

...ge3/train,dev/boston_train,dev_weights-normalization.json

...boston/stage3/train,train+dev/boston_train,train+dev.json

...3/train,train+dev/boston_train,train+dev_normalize-D.json

...on_train,train+dev_normalize-D_weights-normalization.json

...ain+dev/boston_train,train+dev_weights-normalization.json