bumped version to 0.0.1
fixed bug with wrong icon
Extended support for checklist

Now it's possible to specify the minimum number of choices selected
before proceding to the next question
Small fixes

- extended support for headers without answers
- moved the column indexes to constants, so that it's easier to work
with changing excel sheet forms
- extended debugging for input files (doesn't break at first error,
reads all questions and reports types of bugs)
- added new questions to the survey
Merge branch 'master' into devel