The Branch API in bzrlib provides creation and management of Branches.

A Branch represents a series of commits and merges carried out by a user.

Branches are created by BzrDir's:

   >>> from bzrlib.bzrdir import ScratchDir
   >>> from bzrlib.branch import Branch
   >>> dir = ScratchDir()
   >>> new_branch = dir.create_branch()


Existing Branches can be opened directly:

   >>> another_instance = Branch.open(dir.transport.clone('..').base)

or via the BzrDir:

   >>> still_the_same_branch = dir.open_branch()


A branch has a history of revisions on it:

   >>> new_branch.revision_history()
   []


We need to write some more documentation, showing
push and pull operations. Cloning might also be nice.