Update creating-a-theme.txt

clarify the use of orphan theme
Update creating-a-theme.txt

use nikola install_theme orphan
don't exit, return
Merge pull request #555 from areski/patch-1

Update creating-a-theme.txt
Fix #556
Merge branch 'master' of github.com:ralsina/nikola
flake8
minor beginning of Issue #550 fix, still lots to do
Merge pull request #557 from areski/master

align command nikola help and remove dot and Capital letter
more baby steps towards fixing #550
more delayed initialization (Issue #550)
OCD [via #557]

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
More work on #550
Merge branch 'master' of github.com:ralsina/nikola
Made nikola help much more resilient against broken conf.py (Fix #550)
Mark bundles as cleanable (Issue #558)
Merge pull request #560 from areski/master

fix typo
Fix #558
flake8
Merge branch 'master' of github.com:ralsina/nikola