Add samples for manifest templating
Clean-up project.clj template
Use different target folders for different builds

See #101.
Consider possible rename of manifest package in "run"
Reogranize the way gen/ and assets/ are handled
Validate user input in choose-device dialog
Update Neko version in sample and template
Version 0.3.0-beta1
Version 0.3.0-SNAPSHOT
Adapt for multidex handling

With this patch, it is possible to build an application consisting of
more than one dex File, by setting the --multi-dex option in :dex-opts.

For details see
http://blog.osom.info/2014/10/multi-dex-to-rescue-from-
infamous-65536.html
Minor refactoring