Merge pull request #121 from narayank/master

Fix a null pointer exception in SpdyTransport#makeReusable
Ensure we test the correct connection instance.
Add new synthetic header for determining response source.
Merge pull request #122 from square/jw/response-source-header

Add new synthetic header for determining response source.
Merge pull request #123 from square/jw/test-fixes

Ensure we test the correct connection instance.
Add evictAll method to connection pool.

Closes #104.
Merge pull request #124 from square/jw/eviction

Add evictAll method to connection pool.
Add support for following HTTP 307 temporary redirects.

Fixes Android bug 41739.
Fix froyo bug: no more descendingIterator
Merge pull request #126 from square/edenman/seriously-froyo

Fix froyo bug: no more descendingIterator
Merge pull request #125 from iosphere/android-41739

Add support for following HTTP 307 temporary redirects.