added spikephpcoverage but did not get it to work. if somebody wants to play with it look in DoctrineTest on line 122. fixed the coverage report a little

- New feature in documentation: you can now link to other documentation sections with the following syntax:
    - [doc getting-started:installation], or
    - [doc getting-started:installation Custom link text]
- Updated Text_Wiki to 1.2.0
- Documentation should now pass XHTML validator
- Formatted DSN section so that it's easier on eyes
- The single quotes in <code type='php'> won't work anymore due to the Text_Wiki update. Use double quotes instead: <code type="php">. The single quotes have been converted to double quotes in documentation files.
- Modified the links in h1-h6 headings to use the same style as the headings.
- Some refactoring

* Made the documentation directory structure a bit more logical by moving 'docs/en/root.txt' to 'docs/en.txt'.
* Found two more sections from the old documentation that are not yet converted to the new format.

- Added Sensei_Exception

* Fixed a few layout bugs in new documentation
* Fixed documentation table of contents indentation bug in IE6 (fixes #344)
* Fixed a parser bug in Sensei_Doc_Section
* Restructrured a bit some files of the documentation.

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