add motion: double ` for going back to previous position
fix the E selection bug

by change find the next buffer position method
add the test for the situation
Adds deactivate to unbind vim-mode event listeners
Merge pull request #234 from tony612/fix-motion-E-selection-bug

Fix the E selection bug
Add @tony612's fix to changelog
Merge pull request #233 from guanlun/master

add motion: double ` for going back to previous position
Add @guanlun's fix to changelog
removes extraneous newline
Merge pull request #237 from cadwallion/deactivate

Adds deactivate to unbind vim-mode event listeners
Add @cadwallion's changes to changelog
enable repeat prefixes and search commands in visual mode
fix search motion repetition in visual mode