v0.2.0

Mostly internal API changes in this to use names of workspace and projects instead of absolute paths. But some of these changes have leaked outside, so some breaking changes.

Breaking

• Renamed treebundel-prefix to treebundel-branch-prefix
• Changed treebundel-before-project-open-functions two arguments to be the workspace and project names instead of paths.
• Changed treebundel-before-workspace-open-functions now receives the workspace name instead of path.

New stuff

• Moved some functions out of "private" namespace. Feel free to use them:
  • treebundel-project-path
  • treebundel-workspace-path
  • treebundel-bare-path
  • treebundel-read-bare
  • treebundel-read-project
  • treebundel-read-workspace

Dev stuff

• Replaced ERT with buttercup
• Replaced Cask with Eask