merged changes from RC_1_0

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10476 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
add unit test for crc32c and fix cpuid warning

git-svn-id: http://libtorrent.googlecode.com/svn/trunk@10477 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda