Migrate to Enum Singleton pattern for CachedDetails
Fix TomcatValve

Seemed to have broken the TomcatValve appender with a recent change.
Update README/Vagrantfile to mention the new -v flag on test.py
Enable Logit.trace mode in vagrant tomcat configuration
Allow putting Object into HttpField
Fix premature loading of Layout before the LayoutType was selected
Now logs duration of request in Seconds rather than ms. fixes #63
Merge pull request #65 from stuart-warren/next

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