tools: Remove reindent.py

As it's been superseded by inspekt, that has a good
deal of its code.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
tools: Add build_docs.py script

Build documentation and report failures if necessary.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
.travis.yml: Add build_docs step to CI testing

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>