Revert "Converted retrofit interfaces to Kotlin"

This reverts commit 3b8c5d055ffee30501a4f0012ccf00a6e23169ea.
Revert "Introduced the Kotlin compiler and converted the WeatherStore to Kotlin"

This reverts commit d29046e10751b3b3920a5cb72ce38d692100da15.
Introduced RetroLamdba lib and lambdafied all the single method anonymous inner classes.
Committing project files