Merge pull request #8 from osung/master

Added libfm reference manual
5.16 PPT slides
upload converted train/test matrix (input of the libFM) and Python code for constructing input matrix. sequence of the matrix is (userId/itemId/target/age/gender/#OfTweet/itemTaxonomy) and I changed the format of itemTaxonomy (c1.c2.c3.c4) to (c1*100 + c2 + c3*0.01 + c4*0.0001).
Merge pull request #9 from kykyu1103/master

 Matrix for Mid Check Point
submit format code is added, and additional docs are also added.
Merge branch 'master' of http://github.com/osung/13ai