Use SLF4J for logging
Merge pull request #84 from melix/logging

Use SLF4J for logging
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Merge pull request #85 from melix/fix-ordering

Fix ordering of posts/pages
Fix NPE in crawler when a file has an invalid header
Merge pull request #86 from melix/crawler-npe

Fix NPE in crawler when a file has an invalid header
Avoid sharing CompositeConfiguration for thread safety
Disable caching by default
Merge pull request #88 from melix/disable-cache-by-default

Disable caching by default
Merge pull request #87 from melix/configutil-threadsafety

Avoid sharing CompositeConfiguration for thread safety