Master

Added:

* Support for getAssets method, which uses array of key value pairs to perform queries
* Support for query parameters in getAssetsByFolderId and getAssetsByProjectId
This already exists in the SystemAPI. We put it there for intenal consumers like enduro and tattler to use. We don't want it in the public API because phoenix is stateless and there is no way to create a session. So, instead of using the MediaSiloAPI use the derived class SystemAPI