Merge pull request #56 from countschokula/master

InvitionBaseFragment now starts with Invited instead of invites
fixed some major bugs in the cloud code, should now work better. Also the social db handler has now a savety net when downloading invites, cleans the server if needed
Merge pull request #57 from dvicini/master

fixed some major bugs in the cloud code, should now work better. Also th...
new navigation diagram, ui prototype, small GUI fix

ui prototype is still missing invitation screenshots
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Update README.md
improved invitations fragments, less duplicated code
Merge pull request #58 from dvicini/master

improved invitations fragments, less duplicated code
more comments and renaming