get rid of annoying flash when dumping

Can be replicated with the dumping example in landing page:

```python
from arepldump import dump

def milesToKilometers(miles):
kilometers = miles*1.60934
dump() # dumps all the vars in your function

# or dump when function is called for a second time
dump(None,1)

milesToKilometers(2*2)
milesToKilometers(3*3)

for char in ['a','b','c']:
dump(char,2) # dump a var at a specific iteration

a=1
dump(a) # dump specific vars at any point in your program
a=2
```

I might need to turn up the batching in the html rendering.