Update howto.rst
Update howto.rst
Update howto.rst
Update howto.rst
Update howto.rst
Update howto.rst
Update howto.rst
Update howto.rst
Update howto.rst

Added short description of stimulus coding with HDDMRegression to "Code subject responses" and a lengthy description of a model recovery test for stimulus coding with HDDM regression.
Update howto.rst

error in modelrecovery test for stimcoding with HDDMRegressions fixed.
mydata = data_a
mydata.append(data_b)
corrected to 
mydata = data_a.append(data_b)
Merge pull request #28 from gbiele/develop

DOC: HDDMRegression how-to.