Annual Report 2013

Overview:
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Added the 2013 annual report as a git submodule to the main website repo. Also made some small changes to the website files to make provision for the report and added a Makefile.

Instructions:
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To build the site:
1. Clone the repo.
2. Type 'make'. This will pull in the report2013 submodule, build it (which will also build a required Python virtual environment) and then build the jekyll site. When building again after changes the existing python virtual environment will be used.

'make pull' will update the master repo and the submodule.

Dependencies:
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To build the report python and python-virtualenv is required. All other dependencies will automatically be installed in a virtualenv that is created by the Makefile.