V1.2.0 | Stacked graph, date picker, Group support

• Group module support @cagabi #12
• Stacked graph support, reordering feeds and storing CSV display options @CDuffers #17
• fix bug when loading graph widget @TrystanLea
• Date ranges human readable #16 @CDuffers

V1.0.0 | First release using module.json

add module.json