[ADD] git_trunk: submodule support

Introducing git trunk commands support on submodules. It is now possible
to run all commands from submodules just like on main repo.

This makes it easier to work with submodules directly from superproject.

Meaning that user won't need to switch context/projects, separately
develop dependency repository, finish it and then pull changes via
superproject submodule.

[FIX] git_trunk_commands: active_ref_name

Using it be able to always get reference, when needed (when repo might
not be on active branch, but on detached head like tag or raw commit).

[REF] .travis: use unittest over nose

nose package is obsolete now.

[REF] git_trunk: somewhat better typing coverage

[REF] git_trunk: split git_trunk.py

Splitting git_trunk.py for better readability, separating concerns,
reusability.

.gitignore

@@ -7,3 +7,5 @@
 build/
 dist/
 MANIFEST
+# mypy
+.mypy_cache/

.travis.yml

@@ -14,4 +14,5 @@ install:
   - "pip install ."
 
 # command to run tests
-script: nosetests
+script:
+ - python -m unittest discover -v

README.rst

@@ -35,6 +35,11 @@ To know what arguments are available and what they do for each command, use :cod
 
 Remote used is identified by your current branch tracking branch remote. If your current branch does not have tracking branch, then trunk branch tracking branch is checked. If trunk branch does not have tracking branch set, then it is assumed no remote is used for :code:`git-trunk` workflow.
 
+Submodules
+==========
+
+All possible commands can be used same way as on main superproject repository. Note configuration is still saved on main superproject repository config (submodules do not have git config file), but it is separated by including submodule relative path on sections. E.g. main repository section is named :code:`[trunk]`, where in submodule case, it is named :code:`[trunk "relpath/to/submodule"]`.
+
 init
 ----
 

bin/git-trunk

@@ -2,15 +2,16 @@
 import abc
 import argparse
 from distutils.util import strtobool
-from git_trunk.git_trunk import (
-    GitTrunkConfig,
+
+from git_trunk.git_trunk_config import GitTrunkConfig
+from git_trunk.git_trunk_base import DEFAULT_LOG_LEVEL
+from git_trunk.git_trunk_commands import (
     GitTrunkInit,
     GitTrunkStart,
     GitTrunkFinish,
     GitTrunkRelease,
     GitTrunkRefresh,
     GitTrunkSquash,
-    DEFAULT_LOG_LEVEL
 )
 from git_trunk import __version__
 

git_trunk/__init__.py

@@ -1 +1 @@
-__version__ = '0.3.0'
+__version__ = '0.4.0'