added checkInput function
check user input with checkInput function
check user input shoplist  with checkInput function
changed errormsg getRoommateData function
fixed session bug when creating new dorm
added bugfix session create new dorm
fix bug getUserData function case: user has no dorm yet
added regexp bootstrapValidator getdorm_form to resist digit-only entries
fixed dorm_name bug by now saving dorm_name in session when joining an existing dorm
Merge branch 'develop' into inputval

update inputval with bugfixes done in develop branch