added feature spec for body weight tracking
adding body weight, WIP
added unit model
added some unit stuff
more spikiness
wip on body weight and measurement concern
refactoring
refactored scope
passed first feature spec
body weight logging works, minor refactoring
added editing of a body weight entry
added link and some refactoring
implemented delete functionality of body weight entries
some styling
changed gui and tests to accompany
implemented presenters
removed the test for icon-white
fixed merge conflict