Pause pyplot in nfq.py so plot is actuall updated.

On my machine, in the nfq.py example, with render = False, the pyplot
plot never appeared. To fix this, I put in a very short pyplot pause.
Now, the plot is updated in every iteration of the while-loop.
Merge branch 'master' of git://github.com/pybrain/pybrain into nfqplotting
Add a comment to nfq.py to describe my recent addition.
Merge pull request #112 from chrisdembia/nfqplotting

Fix pyplot issue in nfq example.
Merge pull request #122 from wernight/master

Port most of the code to Python3 compatible.
fix the syntax error line 233
Update fem.py
Merge pull request #124 from adrinjalali/master

Syntax error fix on fem.py