[#6] Add Product models + associations + validations

[marcinkornek]

Add model Product with columns:

• name:string
• code:string
• price:decimal
• composition:string
• image:string

Add model Product_color with columns:

• color:string
• image:string

Add model Product_size with columns:

• size:string
• quantity:string

Add table Category with columns:

• name:string

Add table main_category with columns:

• name:string
• • tests

[marcinkornek]

done Add background-image column to MainCategories and use it in dropdown (image in dropdown is from database and could be changed)

[marcinkornek]

done 09.01.2014 make category name in header active when category loaded

[marcinkornek]

done 09.01.2014 Add loading products when scroll

[marcinkornek]

done 09.01.2014 Add <- item/tems -> in product show to change to previous and next item in category

[marcinkornek]

done 09.01.2014 make focus on search field after showing search field

[marcinkornek]

TODO Make all the product as link to 'product show' in 'product index' (now it is only picture clickable, name and price is not a link)

[marcinkornek]

done 25.01.2015 Add URL's to categories in dropdown menu

[marcinkornek]

done 25.01.2015 Add URL's to product show views in products index page

[marcinkornek]

6.1 done (22.02.2015) Extract single product in index view to another file