DOC,ENH: Add RDFa (schema.org/SoftwareApplication) metadata to tools.rst

[westurner]

Links in tools.rst could include edge metadata (e.g. as RDFa)

https://provis.readthedocs.org/en/latest/tools.html

seeAlso: http://www.reddit.com/r/javascript/comments/1fq6gj/use_irc_for_your_github_project_make_it_easier/cacxbxe (schema.org/SoftwareApplication)

[westurner]

See: westurner/westurner.github.io#2

[westurner]

... HTTPS://westurner.org/tools/