Add info build target in docs/Makefile
Fix doc configuration for Info manual
Merge pull request #1 from JonWaltman/fix-texinfo-config

Fix doc configuration for Info manual
Merge from origin/master; manual fixes in conf.py.
Spacing nit.
Use 'index' rather than master_doc.
Merge remote-tracking branch 'origin/master' into texinfo
Add missing closing parenthesis in 'custom.rst'.
Merge pull request #102 from enthought/texinfo

Add info and texinfo build targets in documentation Makefile.