Added almost all params, made front API usable, and added crs transform draw testing.

Next step figure out more stable proj4 parsing of datums and proj etc,
with adding more specific names.
Then consistently make to_esriwkt work.

pycrs/loader.py

@@ -1,5 +1,7 @@
 
 import json
+import urllib2
+from . import parser
 
 
 #################
@@ -10,37 +12,43 @@ import json
 
 def from_url(url, format=None):
     # first get string from url
-    # ...
+    string = urllib2.urlopen(url).read()
+
+    # then determine parser
+    if format:
+        # user specified format
+        format = format.lower().replace(" ", "_")
+        func = parser.__getattr__("from_%s" % format)
+    else:
+        # unknown format
+        func = parser.from_unknown_text
 
     # then load
-    if format:
-        # load string using specified format
-        pass
-    else:
-        from_unknown_text(string)
+    crs = func(string)
+    return crs
 
 def from_file(filepath):
     if filepath.endswith(".prj"):
         string = open(filepath, "r").read()
-        from_esri_wkt(string)
+        return parser.from_esri_wkt(string)
     
     elif filepath.endswith((".geojson",".json")):
         crsinfo = json.load(filepath)["crs"]
         
         if crsinfo["type"] == "name":
             string = crsinfo["properties"]["name"]
-            from_unknown_text(string)
+            return parser.from_unknown_text(string)
             
         elif crsinfo["type"] == "link":
             url = crsinfo["properties"]["name"]
             type = crsinfo["properties"].get("type")
-            from_url(url, format=type)
+            return from_url(url, format=type)
             
         else: raise Exception("invalid geojson crs type: must be either name or link")
 
-    elif filepath.endswith((".tif",".tiff",".geotiff")):
-        pass
-        # ...
+##    elif filepath.endswith((".tif",".tiff",".geotiff")):
+##        pass
+##        # ...