More readme clarifications and examples

README.md

@@ -10,6 +10,11 @@ Usage
 
 If the file is not specified, it reads GeoJSON from the standard input.
 
+The GeoJSON features need not be wrapped in a FeatureCollection.
+You can concatenate multiple GeoJSON features or files together,
+and it will parse out the features and ignore whatever other objects
+it encounters.
+
 Options
 -------
 
@@ -23,7 +28,9 @@ Options
 Example
 -------
 
-    tippecanoe -o alameda.mbtiles -l alameda -n "Alameda County from TIGER" -z12 -d14 tl_2014_06001_roads.json
+    tippecanoe -o alameda.mbtiles -l alameda -n "Alameda County from TIGER" -z13 tl_2014_06001_roads.json
+
+    cat tiger/tl_2014_*_roads.json | tippecanoe -o tiger.mbtiles -l roads -n "All TIGER roads, one zoom" -z12 -Z12 -d14
 
 Geometric simplifications
 -------------------------
@@ -42,10 +49,14 @@ in some places), so I need to figure out an equitable way to throw features away
 It also throws away any polygons that are too small to draw. I'm not sure yet
 if it is appropriate to do more than that.
 
+It should consolidate features in the same tile that share the same type and attributes,
+to make the tile data smaller, but doesn't do that yet.
+
 Development
 -----------
 
-Requires protoc (brew install protobuf), protobuf-lite, and sqlite3. To build:
+Requires protoc (brew install protobuf or apt-get install libprotobuf-dev),
+and sqlite3 (apt-get install libsqlite3-dev). To build:
 
     make