concept cleanup'
concept graph update
Merge branch 'masterDGTal' into MetricConcepts
new MetricSpace concepts (in concepts::) and doc
propagating changes
missing file and faster .travis
doc warning
Metric doc added
Concepts updates and DigitalMetricAdapter added
changelog
changelog number
fixing conflict
doxy fixes
Fixing conflicts
fixing the doc
Merge pull request #870 from dcoeurjo/MetricConcepts

Metric concepts