classifier:
    thread-enabled feature extraction of pfds

data:
    pfdreader.getdata now accepts *args as well as **kwargs
                      useful if you want to extract multiple features at once,
                      and they might have the same key in kwargs (hence only one allowed value)

sktheano_cnn:
      made pickling even better
Note: last commit was tested and works well. mergeable into master
(it had threaded pfd feature-extraction)

*This commit implements threading of 'fit' routine, but needs to be tested
Merge branch 'multiprocess'; commit 'e384fdb3b6b2eaa99eff76a98ed6e5c9bdc19179'