* Refactor template helpers for displaying uploaded images
* Unit test for asset tag
* Unit tests for 'uploaded_image' tag
* Add simple tests for part_image and company_image functions
* Unit test for barcode constructor
* Unit tests for qrcode
* Refactor the 'company_logo.png' to be a new template tag
- Add unit tests
* Adds a new field to the report asset model
- Unique key which can be used to identify particular assets
- e.g. company logo
* Refactor logo image tags
- Make use of existing CUSTOM_LOGO setting
- Adds a "logo_image" template tag for reports
* Remove previous migration - strategy no longer required
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