Fix DPASTE_SLUG_CHOICES alphabet in documentation
Fix non-readthedocs sphinx build

Note, this means you have to set the environment variable
READTHEDOCS=True to use the RTD theme, which appears to have been the
intent.
Fixed typo
Merge pull request #65 from welshjf/doc_fixes

Doc typo fixes
Merge remote-tracking branch 'origin/master' into i18n

Conflicts:
	dpaste/forms.py