udpate the readme a bit w/ what I've implemented recently..

README.md

@@ -7,8 +7,8 @@ up simple code as a Python package, you can import it directly via
 the hash.
 
 There is the concept of aliases to make the import statements easier
-to read.  This is currently limited to packages (on disk).  An example
-is the randpkg in the fixtures directory.  You can put a file named
+to read.  This is currently limited to packages.  An example is the
+randpkg in the fixtures directory.  You can put a file named
 cas_aliases.txt along side your __init__.py file.  Each line of the
 file is:
 ```
@@ -16,13 +16,24 @@ file is:
 ```
 
 Where alias is a simple name, and url is a location to find the file
-at.  Currently, at least on hash url that follows the
-[hash-uri](https://github.com/hash-uri/hash-uri) format w/ a hash
-value of sha256.  The other supported url type is ipfs.  The format
-follows the [IPFS Addressing](https://github.com/ipfs/in-web-browsers/blob/master/ADDRESSING.md)
+at.  Currently, at least one hash url must be specified.
+
+The following url schemes are supported:
+<dl>
+<dt>hash</dt>
+<dd>At least one of these MUST be specified. This is specified at
+[hash-uri](https://github.com/hash-uri/hash-uri) and currently only
+a hash value of sha256 is supported.</dd>
+<dt>ipfs</dt>
+<dd>The format follows the
+[IPFS Addressing](https://github.com/ipfs/in-web-browsers/blob/master/ADDRESSING.md)
 document, and it is recommend that CIDv1 addresses are used, as the
 host portion of a URL is case insensitive, and CIDv0 (the current
-default) values are case sensitive.
+default) values are case sensitive.  An example is:
+`ipfs://bafkreibtbcckul7lwxqz7nyzj3dknhwrdxj5o4jc6gsroxxjhzz46albym`.</dd>
+<dt>https</dt>
+<dd>This is the standard web url that everyone is familar with.</dd>
+</dl>
 
 Usage
 -----
@@ -43,3 +54,15 @@ Currently v1 is defined, and has the following types:
 		Example generated via: shasum -a 256 hello.py
 	a	An alias.  Any aliases must be loaded before being
 		processed.  This is a short name that could be used.
+
+Configuration
+-------------
+
+By default, a configuration file is read from `~/.casimport/casimport.conf`.
+This specifies the priority of the different modules (do you search IPFS or
+HTTPS urls first), and configures each of the modules.
+
+The first time you import casimport, a sample configuration will be created.
+The default is a local cache the home directory, and then to use IPFW
+gateway, followed by normal https urls.
+