Added support to split Blood Pressure measurements

Change-Id: I7af898fe19ad1958b837e2177f73d123d263aee8
Signed-off-by: Jeremy Ho <jujaga@gmail.com>
Fix dose duration field to use text element

Change-Id: I0a785cc2f449c6f9a34424570c7adcaf3190e1ff
Signed-off-by: Jeremy Ho <jujaga@gmail.com>
Added interim method of adding units to measurements

Change-Id: I47dca8ee8de47ba51c5a91a5cbc7a6505c5327d6
Signed-off-by: Jeremy Ho <jujaga@gmail.com>