Testing issues: minimize_along_direction test case was complemented by test for columns only, tests for Matrix methods which used by Munkres class were added (it is hoped, it will be useful for implement support other matrix data type classes).
Adds more style fixes.
Merge pull request #14 from Gluttton/test_issues_004_pull_request

Testing issues...
Merge branch 'master' of github.com:saebyn/munkres-cpp
Updating to the last upstream changes (merge branch 'master' of https://github.com/saebyn/munkres-cpp).