Journalist v0.1.1

• Unit test failed rename and write file checksums. See #54.
• Use Interrupt.assert only. Closes #72.
• Remove _path helper function. Closes #71.
• Create staging and commit directory on create. Closes #70.
• Test replay of prepare. See #54.
• Move commit tests into commit subdirectory. Closes #69.
• Fix unit tests for temp directory rename. See #68.
• Change default temp directory name to tmp. Closes #68.
• Unit test recovery of unlink and mkdir. See #54.
• Unit test failed rename. Closes #54.
• Test a recovery with no partial commit. See #54.
• Validity check directory and primary rename. Closes #67.
• Implement rmdir. Closes #66.
• Externalize prepare and commit. Closes #65.
• Implement rename. Closes #64.
• Unit test unlink. See #54.
• Rename __prepare to _operations. Closes #63.
• Format message for file system errors. Closes #62.
• Rename filename to relative. Closes #61.
• Unit test writing file over staged directory. See #54.
• Unit test resolve name of missing file. See #54.
• Unit test hash in filename. See #54.
• Implement unlink using fs.unlink. See #50.
• Implement mkdir. Closes #60.
• Unit test overwrite of staged file. See #54.
• Unit test partitioned commits. See #54.
• Create specific commit and staging directories. Closes #58.
• Unit test unlink. See #54.
• Implement static constructor. Closes #57.

Closes #73.