Appscale-tools

Highlights of features/bugs in this release:
- Use NodeLayout to determine roles during upgrade
- Fetch latest tag with GitHub API
- Add options for login/test during upgrade
- Recover AppController logs if init fails
- Wait for external port to close to mark app as terminated
- Log the progress of the upgrade script
- Use fixed version of wstools
- Save bootstrap in /var/log/appscale log during upgrade

Highlights of features/bugs in this release:
- Installed libraries in appscale.tools namespace
- Added an upgrade tool command to make future platform upgrades easier
- Generate a crash log without trying to get the locale
- No confirmation for removal of app when test is set to true in AppScalefile

Highlights of features/bugs in this release:
- Removed OSX install script
- Modified UserAppClient calls from the tools to go via the AppController
- Locates keyname file from multiple valid locations
- Better exception handling for errors returned from AppController
- Reduced GCE resource length

Highlights of features/bugs in this release:
- Experimental support for Google Compute Engine service accounts

Highlights of features/bugs in this release:
- Removed the use of root RSA keys
- Assigned application ports will now persist through down/up
- Unify terminate code paths

Highlights of features/bugs in this release:
- Java SDK upgrade to 1.8.4
- Better handling of crash logs
- Better handling of Mac OS X metadata during an app upload
- Cleanup of unsupported AWS instance types