Fix navigator properties to be read-only
Properly split up tests to make them work

The test.done() call was made too early and therefore the test didn't
check the second test run.
Add test for invalid script paths
Fix buggy script path test
Add Node.prototype.contains; fix Node.prototype.compareDocumentPosition; more.

- Add new level "living" to contain stuff from the WHATWG DOM Living Standard. It is now the default level. Fixes #767.
- Add document position constants to Node constructor.
- Implement Node.prototype.contains.
- Update Node.prototype.compareDocumentPosition to comply to the algorithm in the WHATWG DOM LS. Fixes #777.
- Add ENTITY_REFERENCE_NODE to obsolete node types.
- Fix DocumentType.prototype.parentNode to return the document node, not null. Fixes #778.
- Fix small issues with DOCTYPEs being unnecessarily uppercased, and processing instructions disallowed under HTML doc types (which is apparently an old W3C DOM Level 1 restriction, but is not in the WHATWG DOM LS).
No need to keep listing the tests in the README.
Version 0.11.0
Add test to show inconsistency with jsdom.env

jsdom.env is normally used to be the easiest access point to parse a
website. However it doesn't load external scripts by default.
By supplying jsdom.env with the proper features config it is possible to
load external scripts, however, some bug in jsdom.env prevents that the
referenced external script is loaded an processed. If, however, a src or
scripts reference is supplied with the config, the referenced external
scripts on that page are also executed.
Add test for proposed API for env
Redefine API and edge cases better in new .env API test
Introduce create callback

The create callback will be called, as soon as the window for the
document is created, but before any scripts are executed in it. This
allows one to fix the window object with custom functions and missing
jsdom properties without patching jsdom.
Clearly define done and load call timing
Fix remaining timing/ordering issues.
Fix failing tests to be compatible with new api