add vital signs reading code

git-svn-id: https://markus.cdf.toronto.edu/svn/csc207-2014-09/group_0909@136 8153ec5e-17d7-4962-8641-23ff7c14a8d4
fix vital signs reading code (oops)

git-svn-id: https://markus.cdf.toronto.edu/svn/csc207-2014-09/group_0909@137 8153ec5e-17d7-4962-8641-23ff7c14a8d4
add try/catch around 

git-svn-id: https://markus.cdf.toronto.edu/svn/csc207-2014-09/group_0909@138 8153ec5e-17d7-4962-8641-23ff7c14a8d4
fix try/catch

git-svn-id: https://markus.cdf.toronto.edu/svn/csc207-2014-09/group_0909@139 8153ec5e-17d7-4962-8641-23ff7c14a8d4