update to latest HEAD
    
    - Add weak deps. support.
    - Add cashe support for fs diff.
    - Make sure epoch is a string while checking for running kernel. BZ#1200159
    - Fix rounding issue in required disk space message.
    - Have "yum check" ignore self conflicts.
    - Add simple testcase for installing older intermediate kernel. BZ 1063181.
    - Don't look for upgrades for install only packages. BZ 1063181.
    - check if repos list is empty after excluding disabled repos. BZ 1109473.
    - Allow caching local repos. BZ 1125387.
    - Expect KB as well as MB in disk requirements message from rpm. BZ 1051931.
    - Multiple lvm fixes. BZ 1047793, BZ 1145485.
    - Change the sqlite synchronous mode for the history file, to NORMAL.
    - Add CAShe config. and objects, use it for MD and packages.
    - Add query_install_excludes conf./docs and use it for list/info/search/prov
    - Workaround history searching for [abc] character lists failures. BZ 1096147.
    - yumRepos.py - preserve queryparams in urls
    - Don't traceback in exRepoError() when repo info is not available. BZ 1114183.
    - Make check-update respect --quiet option. BZ 1133979.
    - Add armv6hl.
    - Fix removing installed obsoleted package. BZ 1135715.