Add 'Toggle Tree Side' menu item
Rename toggleSide to showOnRightSide

Also added default configuration value
Subscribe to config changes
Fix toggleSide to use atom.config.toggle
Fix tree-view-resize-handle
Replace this.attr with @attr

Also removed console.log call
Dasherize data-attribute
Add missing classes based on side
Revert "Add missing classes based on side"

This reverts commit 358cb137cc4459dbda83d83e27a787c3ff4ae5df.
Add missing classes based on side
Fix removeClass call
Merge pull request #46 from victorgama/toggle-side

Add 'Toggle Tree Side' menu item