website: first pass at recipes section
website: fix up descriptions of recipes
website: fixed recipes wording and title
website: updated recipe to support queries
website: updated recipe to use SERF_QUERY_NAME if event type is a query
website: added agent uptime recipe
website: fixed description of uptime recipe
Merge pull request #177 from ryanuber/recipes

website: recipes page
CHANGELOG updates
demo: Remove use of deprecated -role flag
demo: Add a query handler
demo: Make page dynamic by using a query result
demo: Improve the dynamic page generation
demo: Minor updates
Cutting v0.5.0
demo: Update readme for web demo
serf: add tag persistence using files
agent: add test for parsing tags file
Added command documentation for -tags-file in agent command and webiste.
command: simplified checking of tag conflicts in config options