misc. minor cleanup

* moved $/testfilter.sh to $/util/testfilter.sh (updated Makefile accordingly)
* updated idea in Design.md
* renamed TestParse/TestFetch to TestSimpleParse/TestSimpleFetch.. more tests coming
* parse now sorts its results. test updated.
* moved regexp compilation to init instead of every time parse() is called
* misc comments and cleanup

util/testfilter.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# colorize the output of "go test"
+
+sed ''/ok/s//$(printf "\033[32;1m&\033[0m")/''       | \
+	sed ''/PASS/s//$(printf "\033[32;1m&\033[0m")/''   | \
+	sed ''/FAIL/s//$(printf "\033[31;1m&\033[0m")/''