Added more test for getting binding variables from the Pattern Matcher results.
Definition of Instance struct.
Finished limit extending patterns only via shared variable nodes not const nodes.
Debug on clean up middle result links via using Pattern Matcher.
Roll back to not storing variable bound value nodes for each instance.
Fixed the instance links are not in the same order with pattern because AndLink is unordered problem.
Small changes to example, added commented loop
Added proper stvs to r2l scm file, added aa file with atvs
Created scm files with initial avs for nodes and links

For experimentation purposes
Small changes
Added newline
Added specification of EvaluationLink
Changed number in README
Deleted line
Check if a instance contains duplicate links, avoid adding such instances.
Added threshold Frequency to limit the number of the patterns.
Stop mining when the frequency is lower than threshold.
A small subset of ConceptNet test corpus.
Fixed lock issue for multi-threads.
Amended README