Remove unused `paste` styles.

Ticket: #630
Branch: cleanup/630-remove-paste-styles
Contributers should make pull request to develop branch
Merge pull request #632 from caktus/docs/contribute-to-develop

Change contributing docs to make pull request to develop
Merge branch 'cleanup/630-remove-paste-styles' into develop

Branch: develop
Keep GET params when clicking on a Bootstrap tab
Include current GET params in redirect to next
There was no way to get around this without some Javascript. I created a utility for links which adds a 'next' GET parameter containing the encoded current path, including GET parameters.
Updated release notes
Merge branch 'develop' of github.com:caktus/django-timepiece into develop
Cleanup image files

- Remove some unused image files
- Rename a few to better represent their content and usage

Ticket: #501
Branch: cleanup/501-images
Merge branch 'cleanup/501-images' into develop

Branch: develop
Mention image cleanup in release notes.

Branch: develop
Revert "Include current GET params in redirect to next"

This reverts commit faf4efe81ebb990c0a498db32182b2ae9de1f522.
Non-JS approach to including GET params in 'next' argument
Fall back to username when user has no first/last name
Made 'add_parameters' templatetag
Append after '&' if a '?' exists in the base URL
Merge pull request #633 from caktus/feature/username-fallback

Use username when first/last names are unavailable
Merge branch 'develop' into fix/permanent-tabs-get-params

Conflicts:
	timepiece/templates/timepiece/project/view.html
	timepiece/templates/timepiece/user/view.html
Merge pull request #634 from caktus/fix/permanent-tabs-get-params

Make permanent tabs work with current GET parameters
Merge branch 'develop' into feature/585-track-contract-hour-extensions