internal: Code reorganization to put less stuff in `sources.base`. Interfaces that sources can implement are in `sources.interfaces`. The default page source is in `sources.default`. The `SimplePageSource` is gone since most subclasses only wanted to do *some* stuff the same, but *lots* of stuff slightly different. I may have to revisit the code to extract exactly the code that's in common.

colorama==0.3.1
compressinja==0.0.2
Jinja2==2.7.3
Markdown==2.4.1
MarkupSafe==0.23
mock==1.0.1
py==1.4.23
Pygments==1.6
pystache==0.5.4
pytest==2.6.1
pytest-mock==0.2.0
python-dateutil==2.2
PyYAML==3.11
regex==2014.12.24
repoze.lru==0.6
six==1.7.3
smartypants==1.8.6
strict-rfc3339==0.4
textile==2.2.1
Werkzeug==0.9.6