Outline for ruleXtract tutorial.
Merge pull request #1 from ucam-smt/ruleXtractOutline

Outline for ruleXtract
RuleXtract preliminary + Hadoop cluster setup sections.

Added a preliminary section about requirements, getting
the tutorial code, getting the rule extraction code.
Added a section about setting a Hadoop cluster.
markdown formatting
more markdown formatting
typos
Merge pull request #2 from ucam-smt/hadoopCluster

Hadoop cluster
More info for installation, pipeline overview, commands for
data loading and extraction.
Merge pull request #3 from ucam-smt/rulextractExtraction

More info for installation, pipeline overview, commands for
Added command for source-to-target probability computation.
Merge pull request #4 from ucam-smt/rulextractS2t

Added command for source-to-target probability computation.
Added command for target-to-source probability computation.
Merge pull request #5 from ucam-smt/rulextractT2s

Added command for target-to-source probability computation.
Added command for merging.
First half tutorial on extraction.

Tested commands for this 1st half.
Merge pull request #6 from ucam-smt/ruleXtractTutorialCleanup

First half tutorial on extraction.
Second part of the rulextract tutorial on retrieval.

Also addressed comments on 1st half:
-- hadoop-1.2.1 -> $HADOOP_ROOT
-- commands to start and stop the cluster
-- if "Retrying connect to server" message, need to start cluster
-- make sure commands are run from $DEMO directory
-- indicate location of intermediate output
Subsection about lexical model download at the right place.
Finished rulextract tutorial.

Added a section on how to add a MapReduce feature.
Added two papers to read in the publication section.
Minor corrections.
formatting + minor edits.