Gntshr: work around bug in Xen-4.4 Linux xc_gntshr_munmap

The implementation calls 'munmap' but the interface says 'count' (of pages)
but 'munmap' takes a 'size' (of bytes). This results in multi-page shares
being partially leaked.

http://lists.xen.org/archives/html/xen-devel/2014-08/msg02813.html

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Update CHANGES, bump trunk version to 1.0.3

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Update README.md

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Regenerate OASIS

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Release 1.0.3

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #10 from djs55/workaround-linux

Workaround bug in Linux unmap