As of December 2011, the uMobile project is hosted on Github at https://github.com/Jasig/uMobile-app. The project has a limited number of committers, but others are welcome to submit pull requests to the project. When committing or submitting a pull request, it's important that the new features be implemented on the proper git branch. The uMobile project doesn't haven't a formal branching standard, but generally adheres to branching principles established on this page: http://nvie.com/posts/a-successful-git-branching-model/. The established Git Workflow for uPortal should be understood prior to committing to uMobile: https://wiki.jasig.org/display/UPC/Git+Workflow.
For a guide to branching and merging in Git, see http://book.git-scm.com/3_basic_branching_and_merging.html.
Versions and Releases
The version numbering and naming logic is in line with the approach to versioning described on this page under the "Semantic Versioning Specification": http://semver.org/
Essentially, versions should be numbered as Major.Minor.Patch, and should always increment by a value of 1. When a major version increments, the Minor and Patch numbers must reset to 0.