Adds to the maven generators tools support for the generation of RepoElementFields, a class with static properties with the values of repoElement fields. This way, if the api changes, the mokap-backend breaks and we'll notice
Changed libGDX to 1.5.0 stable.
Merge pull request #912 from RotaruDan/libGDXstableVersion

Changed libGDX to version 1.5.0 stable.
Merge pull request #910 from jtorrente/repoelementfields

RepoElementFields (autogenerated class)
Deleting unused repo classes
GenerateFieldClasses refactored to produce a Fields class for each repo class
Adding filters to repo request
Merge pull request #914 from jtorrente/responseandrequestfields

More to ensure mokap-backend breaks if repo API changes
Merge pull request #915 from jtorrente/backendfilter

Adding filters to repo request