company pages for hourofcode.com

1. created a public/company for 10 companies

2. Visiting hourofcode.com/company will force country to be 'us'

3. Counter on top of map links to /events, used hoc_uri to preserve /country/language

4. Add field hoc_company_s to form

5. @company in hourofcode_helpers personalized counter for each company in map_company.haml

TODO: update map_company's counter to count only company events