v0.6.1

Fixes:
 - auto-complete more than one tag
 - bookmarklet: support titles containing quotes
 - URL encode links when setting a redirector

Major changes:
 - tools: fine-grained file/directory permission checks (installation)
 - tools: check the 'stable' branch for new versions (updates)

Minor changes:
 - add OpenSearch support
 - add a Doxygen makefile target
 - cleanup: remove `json_encode()` function (built-in since PHP 5.2)
 - cleanup: introduce an `ApplicationUtils` class
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