Swap out bootstrap collapse on search options to custom jQuery so we can progressivly enhance.
Allow enter/return press in search form to submit form via JS.
Toggle split-button and normal button on search form for non-js browsers.
Add standard drop-down to select collection on non-js browsers.
Add support for non-js drop down in search form to select which collection to search in.
Add some integration tests on searchOptions now that it is progressively enhanced.