Enable Travis CI

[tajmone]

When Travis CI is correctly setup and working, and the build status badge is green again (See cosmigo/pmotion2svg#1):

• [ ] Check that there are no more links/URLs pointing to the old repository.
• [x] Fix any links pointing to old GH Pages website URL of the pmotion-assets repository.
• [ ] Close the Cosmigo Transferal milestone.

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References

• GitHub Docs » Transferring a repository