Rewrite the template_matching
1.only use the Normalized Correlation Coefficient to find the object.
2.Set a threshold to prevent the irrational object that is the hightest value in the result.
3.If there are any object be match in the source, it will return the position of the object, otherwise return Point(-1,-1).
Merge pull request #2 from andy79923/master

Rewrite the template_matching