Fix segment util to not smoosh segments when a 0% temp is overriding multiple scheduleds
fixes for rendering tooltips during temp basals and suspends
switch to 'id' from '_id' everywhere
fix basalutil test (was sensitive to new lack of squashing)
a possible fix for the ID-sharing problem
Merge pull request #106 from tidepool-org/cheddar/segment-chunks

Fix segment util to not smoosh segments when a 0% temp is overriding multiple scheduleds