Added tests for Jaccard coefficient
Implemented Jaccard coefficient link prediction algorithm
Added tests for Adamic-Adar index
Implemented Adamic-Adar link prediction algorithm
Added tests for preferential attachment
Implemented preferential attachment link prediction algorithm
Updated __all__
Added detailed documentation
Refined documentations
Some refactors
Reduced output precision
Added references to Sphinx source file
Added tests for Katz algorithm
Implemented Katz algorithm
Do not import exceptions
Use assert_almost_equal
Removed unnecessary test case
Updated tests for interface change
Updated codes for interface change
Updated docstring