Update dependencies with more current angular and bootstrap

Also adding new dependency "angular-md" for parsing markdown (preparing code-of-conduct)
Add data for 2014
Show message box if the agenda could not be loaded
Hide speakers menu item if none are loaded from the agenda file
Remove duplicate default year declaration
Add code of conduct menu item + content pages

- code of conduct copied from here https://github.com/devfest-berlin/code-of-conduct (could become subtree/submodule)
- uses angular-md to parse and display local markdown files
Revert hacky changes
Merge pull request #16 from devfest-berlin/feature/2014_code_of_conduct

Update for 2014 and add Code of Conduct
i doesn'r chek the angular update, the other stuff looks so far so good :)