* Fixes in CI (#406)
* Create .gitattributes
* Update .travis.yml
* Update .travis.yml
* travis fix
* only errors are printed in travis log
* spreadsheet errors fixed: duplicate ID in non-visual properties and lack of third axis in an example
* set-strict example fix
* build-examples.sh exits with error status in the case of build error
* redundant command deleted from script
* unneeded image relationships removed
* pptx validation errors fixes
* all output to travis
Co-authored-by: Gunnsteinn Hall <gunnsteinn.hall@gmail.com>
* only input files remain, output deleted
* example changed to produce a new file instead of modifying the old one
* source document with incorrect characterSet is fixed; ppt path is fixed; invalid strict example is removed
* Ignorable attributes added for validating newer versions of Office
* indentation fix
* 4 byte values for rgb attr
* Validate examples in travis
* indentation
* travis files moved to subfolder
* fixed and renamed validate-examples.sh
* avoiding double building
* Update .travis.yml
* Fix indent
Co-authored-by: Gunnsteinn Hall <gunnsteinn.hall@gmail.com>