Filter Comment for theta band

Suggest using a Cheby1 filter type and an order of 3 for theta band
filtering.  Butter will lead to strange filters.
Added a transpose section for data that is not Nx1

Amended an error cause by an iv.tstart/iv.tend that was not Nx1 and thus
could not be concatenated using cat(1,..).  If the iv is 1xN, then it is
transposed.
Merge branch 'master' of https://github.com/mvdm/vandermeerlab