speed up the test by create only chapter for first 10 books
ignore env and program folder
Merge branch 'develop' into feature-admin-upload-book-attachments

Conflicts:
	book/features/steps/__init__.py
Merge branch 'develop' into feature-admin-upload-book-attachments
[f] allow admin upload attachments from back-end

by changing url-field to file-field
and add attachment-model to admin
Merge pull request #3 from squallcs12/feature-admin-upload-book-attachments

finish feature admin upload book attachments