Merge pull request #2 from Miciah/master

Various installation fixes
Whitespace, typo, and other small fixes

01-Overview: Fix non-ASCII apostrophe in "doesn't."

03-Installation: Change "a installation" to "an installation" and use
consistent example IP addresses.

04-VerifyInstall: Change "messenger service" to "message service" and give
example output from `service activemq status`.

06-AddingCartridges: Change ambiguous "they" to "the cartridges."

08-Managing_districts: Stress the importance of districts and change
"mongodb" to "MongoDB."

10-Using_RHC_setup: Tell the password of the "demo" user.

11-Creating_PHP_applications: Change "to be ran" to "to be run."

12-Managing_applications: Change "opeartion" to "operation."

15-Using_the_Admin_Console: Change "Admistrator" to "Administrator" and
"adminstrator" to "administrator"; provide command to create SSH tunnel to
access admin console; provide the correct URL for access to the admin
console, using localhost rather than broker.hosts.example.com; emphasise
that the user must use "http," not "https," to access the admin console;
change "disticts" to "districts"; change "reccomendations" to
"recommendations"; and change "funtionality" to "functionality."

16-Scaling: Change "scale to 5 nodes" to "scale to 5 gears."

17-DIY: Change "push" to "git push."

18-JavaEE: Change "appication" to "application."

20-JBoss-Tools: Change "port-fowarding" to "port-forwarding."

22-creating-quickstart: Change "applicaiton" to "application."

21-using-quickstarts, 22-creating-quickstart: Change "Wordpress" to
"WordPress."

13-Using_Cartridges, 19-Jenkins: Change "rhc cartridge-add" to
"rhc cartridge add."

01-Overview, 02-SubscriptionManagement, 03-Installation, 04-VerifyInstall,
06-AddingCartridges, 07-Managing_Resources, 08-Managing_districts,
09-Installing_client_tools, 10-Using_RHC_setup,
11-Creating_PHP_applications, 12-Managing_applications,
13-Using_Cartridges, 14-Using_the_Web_Console, 15-Using_the_Admin_Console,
16-Scaling, 17-DIY, 18-JavaEE, 19-Jenkins, 20-JBoss-Tools,
21-using-quickstarts, 22-creating-quickstart, and 900-Apendix-A:
Consistently use a single tab to indent commands and code, and drop
trailing whitespace.  Note that this should fix some commands that were not
indented properly and thus were not formatted properly in generated
materials.
03-Installation: Don't specify install_method

Leave install_method unspecified.  For the next training session, we
will have Yum repos already configured.
03-Installation: Mention hosts_domain for node

Mention the hosts_domain in the list of settings that will be used when
installing the node.
03-Installation: Drop GNU Screen

Don't mention GNU Screen; we will use tee instead (next commit).
03-Installation: Use env. vars., not command args

Instruct the read to export the appropriate environment variables before
running openshift.sh, rather than specifying settings as command-line
arguments to openshift.sh, and add a step to verify that these variables
have been set correctly before running openshift.sh.

Use tee to log the output of openshift.sh.