Images were previously directly fetched from google search results,
which was a potential privacy hazard. All image sources are now modified
to be passed through shoogle's routing first, which will then fetch raw
image data and pass it through to the user.
Filter class was refactored to split the primary clean method into
smaller, more manageable submethods.
The image results page seems to have different formatting from non-image
results pages. Should probably revisit this at some point and try to
style the image results page to be more in line with other result types.
Curl requests and user agent related functionality was moved to its own
request class.
Routes was refactored to only include strictly routing related
functionality.
Filter class was cleaned up (had routing/request related logic in here,
which didn't make sense)