0.7.0

• relative-link processor will now handle query parameters.
• Modify panel processor for translating subtitles, by requiring subtitle text as second level heading.
• Modify image processor for translating captions, by requiring caption text between start and end tags.
• Modify image processor to allow finer control of output, in particular when dealing with image with width values.
• Add new tag configuration value tag_argument to override tag name.
• Dependency updates:
  • Update markdown to 2.6.10.
  • Update Jinja2 to 2.10.
  • Update setuptools to 38.2.5.
  • Update sphinx to 1.6.5.