Performance improvement for GridListings

- Using DynamicHeightImageView instead of ParseImageView, as required by StaggeredGridView.
- No longer doing in Fetch on primaryMedia as it has performance impact. Instead doing FetchInBackground.
- Using Picasso to load remote images.
- Minor string updates.
Enabling current location marker and button for Map.
Replacing ParseImageView with ImageView everywhere.

- Using Picasso to load images for better performance.
- Sold badges are now drawn only after the whole image is loaded.
Couple more places removing ParseImageView for ImageView
Removing ParseImageView from ComposeItemFragment
Adding Pan & Zoom and ProgressBar to DetailAcitivity.
Merge pull request #64 from Hawk-It/performance

Performance improvement for GridListings