Added `Item.stamp` to hash key contents.
Switch stamp to a method.
Started adding suspect link tracking...
Fixed stamp storage.
Added indication when tree is building.
Cleaned up ID parsing.
Temporarily enabled failing integration tests.
Fixed failing export tests. Import still failing.
Coercing stamps from boolean.
Fixed test failures (still lacking coverage).
Refactored stamps into a Stamp class.
Added a method to clear suspect links.
Renamed Nose config file.
Fixed invalid argument.
Refactored text read/write and YAML parsing.
Removed an unused function.
Merge branch 'master' into review
Merge branch 'master' into review
Implemented `doorstop clear ...` CLI.
Added stamp() method to UnknownItem.