modified bind_mount and tmpfs plugins to use hooks for shell and chroot
    refactored --shell and --chroot commands [BZ# 619533,728004,745550]
    added input validation for --buildsrpm [BZ# 743173]
    ensured configs don't have execute bit set [BZ# 744013]
    modified root cache pluging to not cache bind mounts [BZ# 744727]
    removed invalid excludes from epel-{4,5}-x86_64 configs [BZ# 533762]
    From Marko Myllynen <myllynen@redhat.com>:
    Set HOME properly when doing SCM checkouts [BZ# 745394]
    Support for setting timestamps for Git checkouts [BZ# 745396]
    From Yury V. Zaytsev <yury@shurup.com>:
    fix incorrect-fsf-address rpmlint warning [BZ#741068]
    From Jan Vcelak <jvcelak@redhat.com>:
    resolve SELinux filesystem mountpoint [BZ# 734781]