Improve commit message behavior

[blee]

1. The user should not be prompted to enter a commit message if there are no outstanding changes in the repository.
2. "BugId:" should not be part of the default commit message.
3. Like Subversion, confman should notice if the user does not write a commit message and ask them if they want to abort.

[ccowart]

In terms of point 2, we should support a commit log template.

[ccowart]

(In [314]) Don't prompt for a commit message if no files have changed.

See #24

[ccowart]

(In [317])

• Made make aware of the confadmin man page
• Fixed disagreement between repository structure between confman setup and confadmin setup
• Templatized log message

See #8
See #24
See #20

[ccowart]

(In [319])

• Implemented abort option on empty log.
• Cleaned up some logic surrounding determining no changes.

Fixes #24