select_list class should be the same as for select

Fixes this problem:

Watir.element_class_for(:select) #=> Watir::Select
Watir.element_class_for(:select_list) #=> Watir::HTMLElement
Provide RSpec expect syntax for specs
Merge pull request #252 from aderyabin/master

Provide RSpec expect syntax for specs
Add inner_html method to elements
Merge pull request #253 from aderyabin/inner_html

Add inner_html method to elements
update changelog
specs for #inner_html and #outer_html are now in watirspec
Cookies#to_a doesn't change original. Closes #250