Global values in javascript and piwik tracking code moved to a different...

Company specific names now read from settings in javascript. Moved piwik tracking code to a different file so that it's easier to remove by a user.
I'm not sure what Django's templates escape, and wanted to test. I expected:
& → &amp;
' → either ' or &quot;
< → &lt;

I think the correct solution is to replace:
' → \'
\ → \\
newline → \n
leaving everything else unchanged in the string.

Does this do the trick?
```
var COMPANY_NAME = {{settings.COMPANY_NAME | escapejs}};
```
https://docs.djangoproject.com/en/dev/ref/templates/builtins/#escapejs