Added ConnectionString

(VPN Required for connection)
Added ConnectionString

(VPN Required) - Fixed csproj
ConnectionString changed from static to const
ConnectionString fixed typo
Merge pull request #4 from DM13B/Gruppe2Alexander

tilføjet abstract DataAccessController med en Connection String, så kan vi arve fra den når vi laver vores egne Controllers i DataAccess-laget
Merge remote-tracking branch 'origin/master' into Gruppe3RutePLan