Fix pull() to change the list instead of creating a new one

[nathancahill]

In Lodash, _.pull() can be called on an array without using the returned value, see the example here: http://lodash.com/docs#pull

Not as short, but more consistent with Lodash.

[coveralls]

Coverage remained the same when pulling 0632575 on nathancahill:master into 157775c on dgilland:master.

[dgilland]

You can eliminate the try/except and break by doing this:

while array.count(value) > 0:
    array.remove(value)

[dgilland]

Not sure on the performance difference between these two methods though.

[nathancahill]

Your method is considerably faster. timeit clocks try/except at 4.41, and while at 3.12.