Change version to 1.0.0
Explicitly require source files
Explicitly load DismissibleBlocksHelper
Update Dummy test app to Rails 4.2.0
Merge controller and helper classes
Add method dismissible_blocks_controller?
Update test configurations

Update config for Rails 4.2.0 engine.
Add path to fixtures for feature tests

Tests failed when feature tests were executed first.
Add docs for dismissible_blocks_controller?