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
RealtimeIndexTask: If a Throwable was thrown it is not a normalExit
ForkingTaskRunner: Upload task logs even when job fails
Merge pull request #349 from metamx/indexing-stuff

Indexing stuff
LinearShardSpec, NumberedShardSpec toString methods
IndexTask: Better logging at the end of each segment
inital commit of topNs
remove unnecessary doc line
Merge pull request #350 from metamx/topN

Approximate TopN Query
clean up doc