Lock/Unlock button to temporarily disable ViewPager navigation in order to correctly interact with ImageView by gestures
Merge pull request #167 from juleZZZ/viewpager_lock

Disable ViewPager navigation when interacting with ImageView
Fix dragging gesture in views like ViewPager

Move re-enabling touch event interception by parents (like ViewPager) after potential scaling/dragging gesture detection. So it avoids the use of HackyViewPager.
Merge branch master into dev

Resolve conflicts:
   - library/src/main/java/uk/co/senab/photoview/PhotoViewAttacher.java,
   - sample/src/main/res/values/strings.xml