Use if/else instead of try/except in python parser

Try/except is faster if exceptions are rare - it's really fast as long
as try works, but in this case we will find exceptions pretty often so
if/else is better.
Update jQuery library to 1.10.2
Get rid of unneeded properties is the JSON output
Limit chart width
Add connection data to tooltips

-Buggy on the big ones, tip gets in the way of the cursor and triggers
mouseout
-Not sure data is being attached in the most efficient way - it will be
slower to load each tip the first time, but since I don't see anything
else looping through the node object, doing it this way means we don't
need to loop through it unless it's asked for.
Update README