Numerous documentation and test code fixes for HTML Purifier loading

- Improve documentation for stub files
- Synchronize stub files between extras/ and library/
- Remove unnecessary include in function file
- Remove special treatment of Bootstrap
- Improve docs for HTMLPurifier, converted singleton to use static member variables and removed reference
- Add HTMLPurifier.path.php stub file
- Update sample test settings
- Reorganize includes in test files

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1559 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/Bootstrap.php

@@ -20,9 +20,6 @@ if (!defined('PHP_EOL')) {
     }
 }
 
-// :TODO: Might be slow
-if (!class_exists('HTMLPurifier_Bootstrap', false)) {
-
 /**
  * Bootstrap class that contains meta-functionality for HTML Purifier such as
  * the autoload function.
@@ -59,6 +56,3 @@ class HTMLPurifier_Bootstrap
     }
     
 }
-
-}
-