website: updated community page
agent: adjusted tags file reading/writing strategy and fixed tests
website: fixed event handler recipe to use canonical sh comparison operator
agent: check if a tags file is set before calling loadTagsFile
agent: add test for conflicting tag options and tags_file config
Mentioned serf-master as a possible event handler in the docs.
website: updated handler router recipe to handle all normal event types
Merge pull request #184 from thedrow/patch-1

website: Mentioned serf-master as a possible event handler in the docs.
agent: Clarify some log messages. Fixes #183.
agent: Increase log level of message to WARN