Merge pull request #1638 from dengemann/fix_fwd_example

FIX/ENH: fix + improve fwd example
missing plot_events in reference
Update montage.py

Using Python3 and the dev version of MNE, I get an error trying to read a montage (.sfp), in line 147/148 of mne/montages/montage.py:
```ValueError: need more than 0 values to unpack```

This is possibly because ch_names_ is a list of items of type S4 and ch_names is a list of strings (see line 100-103).
I get no errors if I add a conversion of ch_names_ to np.string (see line 103).

Don't know if this breaks Python2 or anything further down in the processing pipeline though.
Merge pull request #1644 from jona-sassenhagen/patch-1

Update montage.py
misc
add spatio-temporal clustering example for sensor data

minor fixes

update tests to deal with preload when dropping channels

cleanup

cleanup2

cleanup viz
add statement
typos
ENH: reorganize template modules consistently

fix setup.py

edit manifest

fix attempt setup.py

more setup + py3k fixes

cleanup, add Fieldtrip credits, update reference and whats new

address suggestions from hangout

remove montages.py