doc: Fix underline-too-short warnings.
doc: Fix incorrect document reference.
doc: Fix indentation errors/warnings.
doc: Fix hyperlink targets.
doc: Fix some issues with blocks.
doc: Remove duplicate file.
doc: Remove duplicate label.
Update __all__ to reflect symbols in future/utils/__init__.py (issue #73)
Merge pull request #74 from QuLogic/doc-fix

Small doc fixes
Merge branch 'v0.12.x' of https://github.com/PythonCharmers/python-future into v0.12.x
Add Travis badge (v0.12.x maint)