Add refresh menu item to fetch workspaces from asana.
SAMAppDelegate: extract -getPath:block:
SAMAppDelegate: get projects in selected workspace.
Pods: add BlocksKit
SAMAppDelegate: fetch User Stories names & IDs.
Link against SystemConfiguration.framework to fix compiler warnings.
Extract SAMClient class from SAMAppDelegate.
SAMClient: refactor -getPath:block: to -get:block:

* Get rid of API macro
* Simplify usage