Added SampleData class and test
test and impl of scanLine()
test and impl Point2D class

constructor with no args
constructor with two integeres
added some methods to Point2D and SampleData
--
<Point2D>
 * equals
 * toString

<SampleData>
 * getArray
Moved files
Finish imple and test on SampleData and Point2D
READMEに追記
Merge pull request #1 from satoh-disk/develop

Develop