Bump version of t2-server gem we are using.
Use .ruby-version and .ruby-gemset files for configuration.
Use SVG badges where possible in the ReadMe.
Merge branch 'next'

* next:
  Use .ruby-version and .ruby-gemset files for configuration.
  Bump version of t2-server gem we are using.
Bump version number.
Update changelog.
Add embedding note to ReadMe.
Merge branch 'master' into list-inputs

* master:
  Add embedding note to ReadMe.
  Update changelog.
  Bump version number.
  Use SVG badges where possible in the ReadMe.
  Use .ruby-version and .ruby-gemset files for configuration.
  Bump version of t2-server gem we are using.