Merge pull request #18 from druid-io/igalSite

Igal site
Merge pull request #19 from druid-io/igalSite

added layout header
Merge pull request #20 from druid-io/igalSite

brought into line with format of other posts
Merge branch 'master' into igalSite
new docs
Merge branch 'master' of github.com:druid-io/druid-io.github.io
new new docs
Merge branch 'master' into igalSite
added some tags, fixed typo