0.2-rc4 -> 0.2-rc5 changelog

• Main menu
  • Cover image is now displayed in graphical main menu, if present in current book (#534, #366)
• FBreader
  • It is now possible to bind "Bold on/off" action to button in FBReader (#575)
• Puzzles
  • (V3) Keybindings for puzzles are added, so games are playable on V3 (#642)
  • Puzzles now display their names instead of generic "Puzzles" (#600)
• Mediaplayer
  • (N516) Length of audio files longer than 59 minutes is now displayed correctly in player (#541)
  • (N516) 1min/10min rewind/fast forward buttons added to player (#530)
• Bookshelf
  • Bookshelf has got help, like the rest of applications (#582)
• User interface improvements
  • Brightness of various "dialog" backgrounds has been adjusted and now there is single color theme (#531)
• PDF viewer
  • PDF viewer has been rewritten and works faster and uses less memory than in previous releases (still big files may cause it to fail, especially on V3) (#678, #415, #587, #540)
  • Open PDF file is now displayed in "Current book" entry of main menu (#513)
  • Added "Zoom to text width" mode (#301)
  • Added blank page detection (#303)
• System improvements
  • (V3) System boots and runs faster than previous 0.2-rc* versions (#623)
  • (V3) Live version no longer formats internal storage of device (#550)
  • Doulos SIL font is now available in OpenInkpot packages repository (#281)
  • Memory is freed aggressively for foreground application, so there should be less crashes on big files (#680)