Fix minor issues in user guide

*   Fix broken link to SCP download.

*   Remove requirement to install `ia32-libs`. This package is no
    longer available in current versions of Ubuntu and is no
    longer required when using the Linaro toolchain.

Change-Id: I9823d535a1d69136685754b7707b73e1eef0978d
Documentation for version 1.0

Final updates to readme.md and change-log.md for ARM Trusted
Firmware version 1.0. Also increment the version in the Makefile.

Change-Id: I00fe1016c8b936834bbf7bbba7aab07f51261bbb
Merge pull request #204 from danh-arm/dh/user-guide-fixes

Fix minor issues in user guide
Merge pull request #205 from danh-arm/dh/1.0-docs

Documentation for version 1.0