Changes:
- Bug fix to input.py by @dave-andersen with tests.
- Some fixes to names in the whitepaper
- Include cfloat for FLT_MAX by @benoitsteiner
- Fix broken link in mnist tutorials by @mrry
- Typos and fixes to documentation by @Sohl-Dickstein, @ebrevdo, @vrv,
Yaroslav, @martinwicke
- Fixed unnecessary check around a delete by @girving
- More compatibility tests by @josh11b
- Misc other typos and fixes by Googlers.
Base CL: 107944070
cb9fa5fc9d