Version 1.40 - fixed memory leak

Version 1.39 - fixed PDF viewing.

Version 1.38 - Add background color setting.

Version 1.36 - fixed KitKat displaying HTML Source Code.

Version 1.34 - fixed KitKat text flow wrap.

Version 1.33 - add page navigation buttons.

Version 1.31 - add Immersive Mode for KitKat and option to hide action bar.

Version 1.30 - bug fixed.

Version 1.23 - Scan removal SDCARD.

Version 1.20 - Improved loading performance.