Fixes #103 - MemcachedKeyCharacterError when having whitespaces in doc id
# This is a combination of 4 commits.
# The first commit's message is:
Fixes #115 - Changed Urls to Url in paper

# This is the 2nd commit message:

Revert "Changed urls to url in forms, API, scrapers, coffeescripts, tests. Fixes #115"

This reverts commit 596ef0ea9c45248e5880f66e420484723ec4a84a.

# This is the 3rd commit message:

Revert "Changed url to urls in fixtures"

This reverts commit 8477fe85415d8515d5fa80e5363d5706c5089621.

# This is the 4th commit message:

Revert "Added migration to change urls to url in Paper"

This reverts commit 01ec33ef49e8787e017cd006ee185406daf68ef5.