[20160928105531] Process Scheduling and Code Sync

Build and Process Scheduling

convox build and convox run are now scheduled with ECS rather than always running on the same host as the Rack containers.

Code Sync Updates

Code sync now uses FSEvents on MacOS and inotify on Linux to reduce the amount of CPU used by the file sync process.

NOTE: Our current CLI release process involves cross-compiling on Linux so the cgo extensions required for these features are not yet enabled on MacOS.