Moved backwardSubstitution and forwardSubstitution from Matrix.java to
LinearEquation.java, and modified some getter methods in
LinearEquation.java to return the instances of the class fields.
Merge branch 'master' of https://github.com/khai373/Matrix.git
Moved backwardSubstitution and forwardSubstitution from Matrix.java to
LinearEquation.java, and fixed some getters in LinearEquation.java to
return the instances of the fields class.