added a layout file of NumberSelectSeekBarView
added NumberSelectView class, the parent of SelectNumberView
implemented NumberSelectSeekBarView class
tested NumberSelectSeekBarView class

- changed the class in ProgrammingSpaceManager from SelectNumberView to
NumberSelectSeekBarView
- added android:progress attribute so that 'onProgressChanged()', in the
NumberSelectView, is called at initialization of the class
Changed class name from SelectNumberView to
NumberSelectWheelScrollerView
Refactored and added comment
fixed claims on pull #3

- changed return types of to{Integer,Double}Expression
- renamed 'formated' to 'formatedValue' on
NumberSelectSeekBarView.java:L82
merged pull request
Merge branch 'ui_improvement'