V1.0

• Fix issue TinyMCE link plugin does not work properly when multilang2 is installed.
  Many thanks to Mario Wehr for his contribution.
• Fix: tag replacement did not work in the same way when highlighting was on or off.
• Fix: additional CSS for highlighting the code was not applied correctly.
• Fix: context menu sometimes inserted empty tags, when another language was selected.
• Fix: if an entire paragraph is selected, language tags are now applied inside the content
  (within te block element)
• New settings so that the admin may define a list of languages that can be used with the
  plugin, independent whether these language packages are installed in the Moodle site or not.
• New option to remove all language tags within the text at once.
• New feature, <span> elements use the dir attribute to annotate left to right and
  right to left languages (in standard Moodle annotation).
• New feature: the context menu has an icon to remove the selected language tag pair.
• Enhanced documentation to include new changes and add a chapter about usage.
• Lift version from 0.3 to 1.0 to reflect maturity.

Many thanks to Tai Le Tan from the Open University that
provided a comprehensive pull request.