Move 'delphin' commands to API-accessible module

Resolves #140

.travis.yml

@@ -11,7 +11,7 @@ matrix:
     - python: "3.6"
       env: TOXENV=py36
 install:
-  - pip install -q 'setuptools>=36.0.1' 'pytest>=2.8.0' 'tox>=3.3.0'
+  - pip install -q 'setuptools>=36.0.1' 'pytest>=3.6.0' 'tox>=3.3.0'
   - python setup.py -q install
 script: tox
 

CHANGELOG.md

@@ -9,6 +9,8 @@ these changes are prefixed with "**BREAKING**"
 
 * `delphin.tdl.parse()` now accepts a filename argument and returns a properly
   functioning generator (#104)
+* `delphin.itsdb` works better with gzipped tables with Python 2
+* `delphin.mrs.penman` no longer calls `Eds.from_xmrs(x)` when `x` is an `Eds`
 
 ### Added
 
@@ -44,6 +46,8 @@ these changes are prefixed with "**BREAKING**"
 * `delphin.exceptions.TdlWarning` for notifications about deprecated TDL
   syntaxes
 * `delphin.util.LookaheadIterator` for parsing with arbitrary lookahead
+* `delphin.commands` module to contain logic for `delphin` commands (#140)
+* `tests/commands_test.py` to test invocation of commands (but not results)
 
 ### Changed