Revert "added yahoo_stock_retriever library"

This reverts commit 1b2ae30a1935b8723c7e6d6b962d650ce5576984.
Revert "reorged filestructure"

This reverts commit 24a5ae8554555535c0eb8b5604805908bf20f5de.
Revert "added new file structures to get"

This reverts commit 0b5c231f019543df6ba79009b65b98b0d2866c92.
Revert "reorg file structure"

This reverts commit 61936b4fc8ddad7e3c046861ea0bfb62a4bfa9b2.