fixed typo
Merge branch 'master' into igalDruid
added definitions for master and compute nodes; tweaked spacing between term and definition
added title
fixed formatting on numbered list and code blocks
added anchor for linking to section
updated links and references since these two files contain the lists of firehoses and plumbers they refer to, and pointed to Realtime-ingestion for the example of the kafka firehose
added Realtime-ingestion under Data Ingestion (this is the content split from Realtime, which is now just about the node); moved Firehose and Plumber under Realtime-ingestion
Added titles
Separated realitme ingestion from realtime node info; under Data Ingestion the Realtime link now points to the new realtime-ingestion page
Merge branch 'master' into igalDruid
Merge pull request #340 from metamx/igalDruid

Igal druid