Add ossec-logtest docs for -U unit testing

Adding documentation for the -U argument to ossec-logtest.  This includes a
small example of how to use this test rules.
Merged in jrossi/ossec-docs-git (pull request #1)

Add ossec-logtest docs for -U unit testing
Cleanup the language a bit.
Ignore generated files.
realtime init can take longer than 30 minutes, especially if you
have a lot of files in the directory.
I believe in the Oxfor Comma.
Also, what I believe to be slightly better wording.
More tweaks.
Start documenting some installation quirks, especially with the niche
systems.
Start with creating users on an AIX system. This has been an ongoing
problem (that I missed), pointed out to me on bitbucket by Gael Muller.

The original(?) fix was provided by Kat on the mailing list.
86 the 101
It was an interesting idea, but it isn't panning out. Maybe I should
focus on the manual instead.
tweaks
Fix a spelling issue.
Just a few notes about the output options.
I don't like the beginning of the page, but I'll have to work on that later.
No ideas at the moment.
Start adding some basic examples.
Move the example file to its own directory. That should make an index
of examples easier. Maybe?
Break out these examples as well.
organize these better(?)
If I reorg in one place, I should do it everywhere
Just trying to make it look a bit more like the others.
I really need to come up with a "standard" for this stuff.
This is the last syntax cleanup I'll do before I get a chance to test.