gitignore += .DS_STORE
Refactor warning message for fault download image
merge master
+todo move grabber classes to module
+todo automatically load grabbers from modules (like plugins)
typo  filename_or_url -> url
typo  EpubFileType -> EpubItemType
typo  addr -> page_name
+todo multithread grab pages
+todo DefaultGrabber
refactor BaseGrabber.host no need more
Merge branch 'master' into defaultgrabber
QFix removed old docstring
seperation api and convert tool
generate epub to stream or file
rename html2epub.py -> grabber_manager.py
logging instead print
QFix typo
Merge branch api into defaultgrabber
Merge branch 'api'