Console inaccessible on Ubuntu in PE 2.8.3

Added known issue and workaround for the console being inaccessible on
Ubuntu + PE 2.8.3.

This appears to affect upgrades, no only fresh installations

I initially didn't think a known issue was necessary, since most users
are not doing fresh installs of PE 2.8.3, but since it affects upgrades,
this probably needs to be publicly documented for customers.

https://jira.puppetlabs.com/browse/PE-1679
Puppet 3.3.2 release notes
P3.4: update Windows installer docs

We now overwrite puppet.conf settings based on the MSI properties,
and there's a memory effect you may need to watch out for too.
P3.4: Change Fedora service name back to puppet
P3.4: Note that Puppet can manage symlinks on Windows now
PuppetDB: New low catalog troubleshooting guide

This adds the new guide into the index for master, in ancticipation for a
future release.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #245 from zacharyalexstern/console_known_issue_ubuntu

Console inaccessible on Ubuntu in PE 2.8.3
Merge pull request #246 from kbarber/maint/master/puppetdb_trouble_low_catalog_dupe

PuppetDB: New low catalog troubleshooting guide
Tiny tweak to example in Learning
Win: Note that domain users can be local group members
Win: Extensive updates to package tips

Explaining the deal with versioning, etc.
Added Known Issue re: stopping pe-postgres service. PE-1108
Use _ prefix instead of _real suffix on variables

On the whole, the style in manifests for variables that have been
modified in a local scope and saved to a new variable name have shifted
from using `$foo` -> `$foo_real` to using `$foo` -> `$_foo` due to the
shortness of the form and semantic implications that `$_*` is not
neccessarily human-friendly.
P3.4: Update class containment docs with new contain function
Fix wrong info re: stages and class containment

I had this wrong the first time. See the code here to test the various permutations:

https://github.com/nfagerlund/evil-made-manifest/blob/master/contain_stages.pp
Mention contain function in the bgtm
P3.4: Create new experimental features section in PRM

- Split general future parser stuff and lambda stuff
- Still need to write the overview page
- Still need to strip out the lambda stuff that got removed for 3.4.
- Still need to paste in binder stuff and add msgpack stuff... maybe the binder
  stuff can just be a link to the ARM, since it's become a dead-end.
Updating package repo guide to reflect PE3 integration.
Revised an instruction to make it clearer. Based on user feedback via info@.
P3.4: Add $trusted hash to special variables section of language reference

This commit documents $trusted under the assumption that PP-773 and PP-765 are
already fixed.