added search to tab-bar and created initial views for the search

Added search field and search button as well as some more styles and controllers needed for the search

basic searching should work now, but we still need some styling and code+style for the resultview

search results now being shown (but not yet styled)

productsearch now also showing product icons (and added missing files)

added product icon to productSearch in shopconnector

search results are now clickable. You'll get to the product details on click