add tools pull-deps to cli
hack to support remote repository authentication
Merge pull request #285 from metamx/pull-deps-auth

Implement `tools pull-deps` and remote repository authentication
Merge pull request #287 from metamx/igalDruid

Update to Architecture intro file:
WorkerTaskMonitor: Add log message
RemoteTaskRunner: Run taskComplete after a task times out
updated link to removed Data-Flow page
moved Concepts-and-Terminology to Getting Started section