usage.rst: Clarifies that resuming requires previous options.
connection.py: Sets buffer size to 50MB.
Revert "connection.py: Sets buffer size to 50MB."

This reverts commit 341d318f7bab632a15a18930c95ed704fb73e44a.
http_test.py: Adds a disabled big file test
http_test.py: Adds extra chunked transfer encoding tests.
connection.py: Fixes handling chunked-transfer due to regex fail.

Closes chfoo/wpull#54.
scraper.py: Strips newlines from links.

Closes chfoo/wpull#55.
changelog: Adds "newlines in links" entry. Updates latest to 0.22.4.
Merge branch 'develop'
Bumps version to 0.22.4.