Admins of ctnrs can now edit ctnrs without having to change their current ctnr
Add description field to Range
Migrate range comment as description
Add help_text to Range.description
`name` = first 50 chars of first line of comment

Still put the entire comment in `description`.
Add migration
Modify stringifiers; add 'name' to detail view
Move 'name' column to the left of 'range' column
Refactor suggested by @zeeman
Remove migration (it's out of date)
Improve CLI disallowed attribute error

(The web UI has its own error, which might need improvement but is
unrelated.)
Import a thing; print attribute name, not pk
Merge branch 'master' into range-comments

Conflicts:
	cyder/cydhcp/range/models.py
	cyder/management/commands/dhcp_migrate.py
Integrate new Range.__unicode__
automatically select columns in tablefy
Fix a couple things
explicit import of cached_property
Merge pull request #456 from murrown/optimize_tablefy

Automatically select columns in tablefy. All tests pass. Fully functional. Merging.
Pep8 formatting
Merge branch 'Ctnr_Detail_View_Perms' of https://github.com/church29/cyder into church29-Ctnr_Detail_View_Perms

Conflicts:
	cyder/core/ctnr/views.py