added a functionality to fetch images from URL in _novice.py
added description and exmaple for new functionality
of fetching images of url
changed test url in example for the Picture(object)
changed the method of checking if a string is URL
1. removed regex code which was used earlier to check if a string is
url. (regex code taken from django)
2. Now checking if a string starts with http(s) or ftp(s).
added a dummy useragent in Picture class while fetching image
using URL.
changed urlparse library from six.moves.urllib_parse
to six.moves.urllib.parse
corrected syntax for error handling while fetching image from
a URL in class Picture
changed the method of fetching images in Picture class
using file_or_url_context to get context and calling imread
and imghdr on returned context
removed unnecessary imports from _novice.py
made minor changes in syntax
1. merged is_url and file_or_url_context in one import statement
2. changed syntax to check if path is a URL. now more compact
Merge pull request #916 from neerajgangwar/master

Add loading from URL in novice module