vm bootstrap: add java, hadoop, hadoop-talk source
add MapReduce diagram from Wikipedia
Vagrantfile: fix vim modeline
Vagrantfile: give the vm 1GB

With .75GB RAM, Hadoop was starting *very* slowly.
Revert "Vagrantfile: give the vm 1GB"

This reverts commit e0a50c728e30181139cb2e6b5088bb3a4b6d14c1.

The problem wasn't lack of memory, it was a VERY slow nameserver in
/etc/resolv.conf.

strace wasn't too useful for debugging this.

jstack was, somewhat: it showed that the main thread was often waiting
for datagrams or something, and I guessed the issue was slow DNS
lookups.
vm ~vagrant bashrc: add JAVA_HOME

Hadoop requires it
disable apport

Remove the overhead of diagnosing crashes.

The last time I booted it was grinding away, trying to diagnose some
java crash. No thanks.

http://askubuntu.com/questions/93457/how-do-i-enable-or-disable-apport
https://wiki.ubuntu.com/Apport
install real Vim

How am I supposed to do anything without Vim?
vm: abstract Hadoop version, set HADOOP_HOME
vm: use HADOOP_PREFIX instead of HADOOP_HOME

Using HADOOP_HOME causes Hadoop to throw a deprecation warning.
Add simple log crunching example

Same code I used in the Linux Journal article