set to rc.2
CB-5875 Updated version and RELEASENOTES.md for 3.4.0-0.1.0
CB-6049, CB-5181 Enable stdio for build sub-commands & add a spawn() helper.
CB-5181 Use spawn helper in emulate.js and run.js
CB-5181 Use spawn helper in hooker.js. Catch error event in spawn helper.
CB-5885 Remove no-longer-necessary iOS project file cache from CLI.
CB-5181 Use spawn helper in platform.js
Remove a case of improper re-throwing of an error (and removing stacktrace)
CB-6076 Make "Generating config.xml from defaults" a verbose log
Refactored config_parser.js to simply both it and its tests. Details:

- config_parser -> ConfigParser
- Deleted unused methods
- Don't auto-write from setters
- Stop mocking elementtree functions in tests
CB-5299: Use new reapply_global_munge() from plugman

This is based on reapply_global_munge() from plugman's config-changes.
This function loads the global munge from platform json and applies all of it.
The munge is not re-generated from plugin.xml files as it was previously done.
CB-5647: Remove .staging dir.

Based on plugman changed that moved the <asset> copying stage from install to
prepare.