added
- button to create order set
- hidden_field_tag to pass project id to order set controller
so the order set could be created from project detail page,
and the project could already be selected.
let order set controller retain project_id parameter in OrderSet::new,
so the project in order_sets/new.html.haml could already be selected.
Wrote test for checking if the project of order set new page is
already selected, if it was created from a specific project detail page.
- changed to pass project_id parameter to OrderSet::new
- changed to show generated OrderSet above with the project selected in
  new.html.haml
changed the below test to check from project detail page
- specify 'user creates an order set from project detail page' do
changed to use link_to helper(not submit_tag)
Merge pull request #52 from root04/xengineer/create_order_set_from_project_detail_page

Xengineer/create order set from project detail page