model naming conventions

[Ján Neščivera]

we should stick to EF naming conventions in model:

• use plural for table names

  ERNI-Photo-Database/server/ERNI.PhotoDatabase.DataAccess/EntityConfiguration/TagConfiguration.cs

  Line 11 in 9ba85f1

   builder.ToTable("Tag"); 

• use plural for collection navigation properties

  ERNI-Photo-Database/server/ERNI.PhotoDatabase.DataAccess/DomainModel/Photo.cs

  Line 16 in 9ba85f1

   public List<PhotoTag> PhotoTag { get; set; } 

[Marek Linka]

Agreed.