New TeamBoard service and States with buffer capability. #165

Commits include:

Refactored state tests out of integration into unit
Added ability to specify buffer states, ensured States exposes traditional string-based API
Added active property to states
Initial new board functionality and wired up test view
Wired up per-column WIP limit display
Boards can now have cards added to them
Wired up card adding and old metrics to new team view
Added WIP state to boards
Wired up sip state to headers
Board wip now counts attached buffers
Wired up team navigation
Attaching cards to a board
Displaying and styling cards
Boards have concept of placeholders
Wired up placeholder display
Ordering WIP by current_cycle time
Got backlog ordering working
Added link to full backlog
Added backlog markers
Wired up sorting
Switched from 90% to 80% confidence
Version bump
Merge t165: Adds new TeamBoard and States with built-in buffers. Fixes #165