requirements.txt: add sqlalchemy & feedparser

from .travis.yml && travis.yml: use requirements.txt.

.travis.yml

@@ -8,7 +8,7 @@ python:
   - "pypy"
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install:
-    - pip install pytz feedparser charade sqlalchemy python-gnupg python-dateutil --use-mirrors
+    - pip install -r requirements.txt
 # command to run tests, e.g. python setup.py test
 script:
   - echo $TRAVIS_PYTHON_VERSION

requirements.txt

@@ -4,3 +4,5 @@ pytz
 python-dateutil
 python-gnupg
 Twisted
+feedparser
+sqlalchemy