Use Sqlite Instead of MySQL

It's easier to set up, which means that it's easier to contribute to
this project.
Update web_steps.rb

add warning to doc:
"I should get a download with filename" step doens't work with Selenium.
Add file attachment steps, bump version
Update file_attachment_steps.rb

Add to doc howto set updated_at for a file attachment step
Fix listing of test files in gemspec
Align Rakefile with our other gems
Allow testing emails with multi-paragraph bodies (#23)
Fix Rakefile for Travis
Merge pull request #22 from jherdman

Conflicts:
	Rakefile
	spreewald.gemspec
version bump