python notebook -> IPython notebook

Ran the following:

```
grep -l "python notebook" *ipynb | while read fname
do
  sed s/"python notebook"/"IPython notebook"/g "$fname" > tmp
  cat tmp > "$fname"
done
rm tmp
```
Removed end of line semicolons.

Ran the following:

```
grep -l ");" *ipynb | while read fname
do
  sed s/");"/")"/g "$fname" > tmp
  cat tmp > "$fname"
done
rm tmp
```