Add -q0 option to nc in docs

With some versions of nc, the connection is kept open after all data is sent. Using -q0 parameter will make nc quit immediatly after EOF on stdin.

Debian has two debian packages for nc: netcat-traditional and netcat-openbsd. The former hangs after EOF on stdin, whereas the latter quits. I assume the expected behavior is to quit nc after sending the metric data.
Composer: create from URL

New function in the composer toolbar to create a graph from a URL.
This is based entirely off of @obfuscurity Stupid Graphite Tips
https://speakerdeck.com/obfuscurity/stupid-graphite-tips?slide=12

Icon is Creative Commons:
https://www.iconfinder.com/icons/49529/link_url_icon

Conflicts:
	webapp/content/js/composer_widgets.js
Correcting Variable reference

LDAP_URL does not seem to exist. I am assuming this is meant to be LDAP_URI.
Remove old-style admin classes
Fix #403 #445 -- avoid creating the default profile at import time

`defaultUser` is no more. It was only needed for `getProfile`, which now
creates the profile on the fly.

The code also uses `Foo.objects.get_or_create()`, which is safer than a `try`…
`except` block around `Foo.objects.get()`.

The default profile is now created with an unusable password instead of a
random one, which avoids computing an expensive hash each time
`default_profile()` is called.
Remove tabs from code
Base for tests
Fix travis?
Debug sys.path
path
Try with discover-runner
Add tests for browser views
Trivial test for version
Prepare log dir
Add ceres dir
Update config-local-settings.rst

The docs are incorrect compared to the code:

```
$ grep -nri REMOTE_USER_AUTHENTICATION .
./webapp/graphite/local_settings.py.example:131:#USE_REMOTE_USER_AUTHENTICATION = True
./webapp/graphite/settings.py:94:USE_REMOTE_USER_AUTHENTICATION = False
./webapp/graphite/settings.py:209:if USE_REMOTE_USER_AUTHENTICATION:
./docs/config-local-settings.rst:217:REMOTE_USER_AUTHENTICATION
```
Merge pull request #537 from jakobadam/master

Complete instructions for setting up a dev environment.
Merge pull request #534 from jib/remote-auth-doc-fix

Update config-local-settings.rst
Merge pull request #528 from brutasse/fix/tabs

Remove tabs from code
Merge pull request #504 from krets/patch-1

Correcting Variable reference