Updating examples for Planet 2 package system
Update postface.txt

a typo
though --> through
Fix for subtree in clone.py
Add example: Asynchronous request-reply single-threaded server in Python that spawns a request handler each time a request is received
Update formatting
Merge pull request #368 from cosmoharrigan/master

Add Python example of async request-reply single-threaded server with request handlers
Correct PollItem definitions
add eagain.py
add Python/dechat.py
add Python/udpping3
Merge pull request #369 from takluyver/patch-1

Correct PollItem definitions in Go example
Merge pull request #371 from minrk/morepy

add a few Python examples
Update chapter1.txt

Fixed typo. The word should be 'nodes' not 'boxes'
Merge pull request #372 from imor/patch-1

Update chapter1.txt
Translated the 'Suicidal Snail' example to Java
Merge pull request #373 from mryndzionek/master

Translated the 'Suicidal Snail' example to Java
Some of the examples don't have a space after 'main' and thus were not being built by the build script.

This patch fixes this.
Merge pull request #374 from mryndzionek/master

Some of the examples don't have a space after 'main' and thus were not b...
Updated to use Digest::SHA
Merge pull request #376 from malexer/patch-1

Updated to use Digest::SHA