Updating README to remove dependency on BeautifulSoup

Fixed all outstanding issues introduced by Instagram redesign

- Fixed inability to download photos
- Wrote new code to overcome infinite scroll
- Removed ability to specify number of photos to save to simply usage
- Added user agent string
- Refactored how photos were saved: now makes urllib2 request with headers
- Removed dependency on BeautifulSoup
- Removed dependency on urllib. now relies only on urllib2

Merge conflict fix

Changing size, position of Selenium window

Changing size, position of Selenium window