Minor documentation fix

float was written as flaot, when copying and pasting the schema from
the documentation the pig script would fail because flaot is not a
data type
Fix a bug in macros/util.pig recsys__GetQuantiles

Utilizing datafu-0.0.10.jar was causing an exception when feeding data
in containing negative signals.

By upgrading to datafu-1.2.0.jar this exception no longer occurred
Merge branch 'master' of github.com:mortardata/mortar-recsys

Conflicts:
	udfs/java/recsys-udfs.jar
Merge pull request #21 from mbrio/master

Minor documentation fix