Defined .eosgi.dist.xml at the project level

[lgathy]

This would be a very handy feature, because in certain cases the project just simply has to change some configurations coming from the distPackage zip defined by the framework reference.

A good example is: parsable files, if we want to add additional ones, or simply change or add new startup scripts to the dist. Also, if this is implemented then the .eosgi.dist.xml file could be optional in the distPackage zip.

[lgathy]

Created a PR for my proposed patch:
#39