 What new?
------------------------------
1.1.1 02-21-2015
    - added a feature to extract relation using coocurrence
    - added a new function: xtest for comparing each pair relations
    - fixed the problem in the function xconfig 
1.0.6	30-10-2014
    - added a new function graph proportion (xprop)
    - added new functions: xdata, xdata_value
    - updated function graph venn (xvenn)
    - updated documentations
    - updated the code Perl: building relationships
    - fixed the path problem
    - fixed the "inclusions lexical" problem
    - fixed the spelling problem 

0.0.4	20-08_2014
    - first public release on CRAN

