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.
Port most of the code to Python3 compatible.
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
Refactor sequential dataset.

Simplify a bit but mostly use izip to improve the performances of very large
dataset.

Note: dataset.vectorformat seems not to be used and that's good because if
at least we can make sure vectorformat is never list, then dataset should
always use np.array data types. If dataset uses lists, the performances drop
drastically. If we know dataset only uses np.array (i.e., drop support for list)
then we can replace all ravel(x) by x.ravel() which is much faster. If we can
remove vectorformat completely, I guess we could replace x.ravel() by x which
is even faster.
Add plotting functions for ClassificationDataSet.

Those plotting functions are a quick way to check visually how well a module
is classifying correctly a dataset.
Merge pull request #128 from wernight/master

Refactoring and add ClassificationDataSet plot helper.
added MixtureDensity files from Martin Felder's commits from 2008
change NotImplemented to NotImplemetedError
example_mixturedensity.py now runs against latest PyBRAIN code
several small fixes
Merge pull request #138 from JackKelly/master

Gaussian Mixture Density layer
Pybrain3 compatability fixes
Update blackboxoptimization.py
Update fnn.py