Update to the lastest version of the Ubuntu SDK

- Switch to using the ubuntu-sdk-14.10-qml-dev2 framework
- Update the version of the JSON security profile
- Update to using Ubuntu.Web 0.2
- Add the now-required webview security policy group
- Update the click packaging tool
Remove use of the Friends API

The Friends app and API is being removed from Ubuntu Touch as it wasn't
designed to work under confinement and has some other issues as well.
The only thing it was used for was for friendly relative time strings,
which can easily be done with qml-extras. For simplicity, this is
wrapped in a fake object which works like Friends.

- Replace the friends object with a QtObject that links to
DateUtils.friendlyTime
Derefence symbolic links when copying project libs
Support for pagination in GitHub Issues
Improved GitHub caching
Ignore GPUCache
Add ability to create new issues

- New issues sheet is now a page
- New issues page is connected to GitHub API
- Sort issues by number in planner and pulse
Various fixes
Merge branch 'replace_friends' into udata_backend

Conflicts:
	backend/services/OAuthPage.qml
	clickpkg
	project-dashboard.qml
Lots of work on the GitHub plugin