implement generalized Differ and Syncer classes, add general Resource type

co3.egg-info/SOURCES.txt

@@ -7,11 +7,14 @@ co3/co3.py
 co3/collector.py
 co3/component.py
 co3/database.py
+co3/differ.py
 co3/engine.py
 co3/indexer.py
 co3/manager.py
 co3/mapper.py
+co3/resource.py
 co3/schema.py
+co3/syncer.py
 co3.egg-info/PKG-INFO
 co3.egg-info/SOURCES.txt
 co3.egg-info/dependency_links.txt
@@ -27,14 +30,18 @@ co3/databases/fts.py
 co3/databases/sql.py
 co3/databases/vss.py
 co3/engines/__init__.py
+co3/indexers/relational.py
 co3/managers/__init__.py
 co3/managers/fts.py
 co3/managers/sql.py
 co3/managers/vss.py
 co3/mappers/__init__.py
+co3/resources/__init__.py
+co3/resources/disk.py
 co3/schemas/__init__.py
 co3/util/__init__.py
 co3/util/db.py
+co3/util/paths.py
 co3/util/regex.py
 co3/util/types.py
 tests/test_co3.py