Prevent accidental chapter changes

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Scroll vertically but also a little bit horizontally. The chapter changes.

What is the expected output? What do you see instead?
I think the horizontal swipe gesture should work the same as with other Android 
apps; a horizontal swipe _all the way to the left or right side_ should 
register. A partial horizontal swipe should not. The app should also scroll the 
next/previous chapter into view as the gesture is performed so the user can see 
what they're doing.

What version of the product are you using? On what operating system?
Latest version on Android 4.1.2.

Please provide any additional information below.

Original issue reported on code.google.com by SamPalm...@gmail.com on 1 Apr 2014 at 5:53