Introduced new summary formatter. First draft; WiP.
Merge branch 'master' into status-formatter-summary

Conflicts:
	cmd/juju/status.go
	cmd/juju/status_test.go
Implemented feedback from review.

- Migrated formatter to status_formatter.go
Better format descriptions & better port format.

- Correct comment on StatusFormatter(...) method.
- Added formatter help information in the status help message.
- The port list is now split into rows with 3 columns.
Corrected issues from review.

- Added copyright notice.
- Migrated to postifx increment style as opposed to += 1
Merge branch 'master' into status-formatter-summary

Conflicts:
	cmd/juju/status.go
	cmd/juju/status_formatters.go
Corrected index out-of-range bug. Fixed test.
Migration towards an object-oriented approach.
Addressed feedback from review.

- Status help now contains information about all formatters.
- Added space between import lines in accordance to style-guidelines.
- Migrated openPorts to juju/utils/set.
- Removed unnecessary string conversion.
- Migrated SummaryFormatter to internal type.
- Made error message when unable to convert type more helpful.
Addressed issues from review.

- Brought some variables out of if/else scopes.
- Method signature for delimitValuesWithTabs now takes only string arguments.
Merge branch 'master' into status-formatter-summary

Conflicts:
	cmd/juju/status_formatters.go
Merge pull request #801 from katco-/status-formatter-summary

Status formatter summary

https://docs.google.com/a/canonical.com/document/d/1olIjfnMIKPbNMmNBhfjwlnzdRvY-xBKygpIOhv7QIkE/edit
http://reviews.vapour.ws/r/66/
Make sure we respect the environment data dir.
Respect the environment logs dir.
Accommodate a missing .ssh directory.
Be more flexible on the init conf names.
Handle the missing nonce.txt case.
Set LogsDir for test.
Convert nil resources to empty strings.
Split the backups create API code into its own file.