#13 Update TTEntry.java by applying CheckStyle suggestions

[Tavon Hannah]

1) Install CheckStyle plug-in in Eclipse, "Checkstyle Plug-in 6.5.0"
2) After installation, Click the PowerFour project and then go to Project -> Properties in the Top bar menu.
3) Click the Checkstyle menu item on the left and check the "Checkstyle active for this project" checkbox
4) Set Checkstyle to Google Checks(Global) and select OK.
5) Go through TTEntry.java file and apply suggestion. Ignore the "First sentence should be present" suggestion that appear for JavaDocs.

Note: Change Tab space to 2 versus four, to eliminate additional suggestions about tab spacing.

[Tavon Hannah]

Code was reformatted in revision 26.