Updated MagicTradersCardSearcher to use the deckbrew.com api

Added in required project files.

Updated .gitignore paths.

Removed unused field from Card.java.
Removed Apache HTTP library.

Replaced MagicTraders.info search with Deckbrew API search.

Replaced references to 'Current Price' with 'Median Price'.

Removed unecessary error handling and simplified the remaining error
handling in search activities.