Merge pull request #28 from rkawauchi/master

add perceived_health
Change eye_health to health in database
change eye_health to health in people generation

Distribution is incorrect!
health changed to health_utility to be unambiguous
health changed to health_utility in people.py
Merge remote-tracking branch 'upstream/master'
Merge pull request #29 from rkawauchi/master

updated state names in list in perceived_health
health_problems are generated as part of the database
Merge branch 'master' of https://github.com/Vadskye/IHK
Merge remote-tracking branch 'upstream/master'
updated the mean for generate_health_utility