MathDoku Notable

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ver.1.06
- Puzzle generation algorithm improvements(generates Hard level puzzles slightly harder than the previous version)
- Puzzle stock update
- Added difficulty level Medium to 4x4 and 5x5 size puzzles
- Added Google +1 Button to the main screen

ver.1.05
- Added Mathdoku Rules dialog

ver.1.04
- Layout improvements(mainly for tablet devices)
- Stop displaying compatibility menu button(to conform to "Designed for Tablets" in Google Play Store)