Increase the size of the pages used in CachingDataSource (total amount of...

Increase the size of the pages used in CachingDataSource (total amount of memory used remains the same) to compensate for reduced locality of audio/video data requests. Also fixes a mistaken trailing "\r\n" in the range header and better error handling on http connection.

Change-Id: Ic9a6ef204362bc9afdc61e081c76bc62e5ef92ad
related-to-bug: 2580785