Updated changelogs and readme's.

gui/README.md

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+The Scyther tool
+================
+
+Scyther is a tool for the symbolic analysis of security protocols. It is
+developed by Cas Cremers, and is available from
+<http://people.inf.ethz.ch/cremersc/scyther/index.html>.
+
+The below instructions apply only to the *distribution version* of
+the Scyther tool. If you are working from the source files, some paths may be
+slightly different, and it is recommended to follow the instructions in '../README.md'.
+
+Running the scyther tool
+------------------------
+
+### Graphical user interface ###
+
+The graphical user interface can be started by running `scyther-gui.py`,
+e.g., enter the following in a terminal and press return
+
+	python ./scyther-gui.py
+
+### Command-line usage ###
+
+In the directory `./Scyther` there should be an executable for the
+Scyther backend. Its name depends on the platform:
+
+ * `scyther-linux` (Linux)
+ * `scyther-w32` (Windows)
+ * `scyther-mac` (Mac OS X)
+
+If this executable does not exist, you probably downloaded the source
+files, and will need to compile it first. See `../README.md` for further
+details.
+
+There are also various test scripts (for usage in Linux) in this
+directory.
+
+Obtaining the sources
+----------------------
+
+Scyther is being developed on *Github*, and its complete source files are
+availabe from
+<https://github.com/cascremers/scyther>.
+
+Manual
+------
+
+We are currently rewriting the manual. The current (incomplete)
+distribution version of the manual can be found here:
+
+  * `./scyther-manual.pdf`
+
+
+Protocol Models
+---------------
+
+The protocol models have the extension `.spdl` and can be found in the following directories:
+
+  * `./Protocols` and its subdirectories.
+
+License
+-------
+
+Currently the Scyther tool is licensed under the GPL 2, as indicated in
+the source code. Contact Cas Cremers if you have any questions.
+