Issue #239 - Show confidential status on issue overview and detail

See merge request !25

- Use compund drawable instead of an imageview
- Reset compound drawable every time so that viewholders being reused show the correct confidentiality status

- Show the icon in list of issues if issue is known to be confidential

- Show confidential icon as a compound drawable if issue is known to beconfidential
- Modify string resource to include issue number for easier formatting

Issue #231 - Open images in full screen when clicked

See merge request !24

- Remove unncessary callback for Picasso
- Set click listener for image in factory

- Refactor code to use factory instead of directly instantiating
- Open images in fullscreen when clicked

- Add new values to colors, strings and styles

Add custom icon/name for leak canary

New Build Naming, More Info in Build Description, & Fixed Build ID Bug

See merge request !23