Bug 1346025 - Move 'python/compare-locales' documentation and mach command to 'tools/compare-locales', r=Pike

MozReview-Commit-ID: bkrH4YAD7S

--HG--
rename : python/compare-locales/docs/glossary.rst => tools/compare-locales/docs/glossary.rst
rename : python/compare-locales/docs/index.rst => tools/compare-locales/docs/index.rst
rename : python/compare-locales/mach_commands.py => tools/compare-locales/mach_commands.py
extra : rebase_source : f1e86ef137a4f7765c5f4917121707bea900646c