Dynamic read spreadsheet file

First read of a dynamic spreadsheet, transformations by Matt Casters
(http://www.ibridge.be/?p=194)
* read example spreadsheet provided by Matt (location laptop JAdH)
* output files are written to /tmp
Dynamic path to input files (path_to_dir)
Adjust for our type of spreadsheet

each row has:
* respondent_id (order in input file)
* question
* answer (string)
* fileName
generate the microsoft excel input and row normaliser question and answer steps used in questback etl scripts for 1000 columns
import questback module questionnaires to warehouse

* first sheet contains ruwe data, with date column, further columns are
all module questions in a table or single questions
* files are of type xslx
* created for 2013-2014 meting1
* importing of earlier files does not succeed yet
dynamic input example of Matt using metadata injector
create hmac authenticaton key used by akvoflow
first test to import worldbank indicators
convert custom client codes to webenq4 codes
warehouse database model for questback modulecode surveys