Updated logging documentation on a common place.

* All logging information now resides on it's own document where all the currently documented features are explained.
* The master and minion logging configuration sections are now minimal and direct each option to the right place on the logging doc.
* A link to the logging doc was also added to the configuration document topic to help debugging issues when troubles are found.
* Headers fixed in the minion and master configuration docs
Direct curious developers to the proper document.
Added support for elementary OS (Ubuntu derivative)
Merge pull request #6971 from admiralobvious/add-elementary-os-support

Added support for elementary OS (Ubuntu derivative)
SaLT -> Salt
Merge pull request #6972 from ajithhub/patch-1

SaLT -> Salt
Minor updates to include the external logging handler documentation.
Fix exception caught when mtime_map parent dir does not exist

This fixes an exception that was introduced in 342a6ae. Also, using
os.error does not catch IOError execeptions, so this has been changed as
well.
os.error does not catch IOError

Modified exceptions to include IOError
PEP8 (two lines between functions)
Better way of emphasizing S, L, and S in docs

Pull req #6972 negated a 100% intentional design decision, intended to
draw attention to the S, L, and S in "SaLt State file" to show why they
are called "SLS files". This commit reverts that change, and bolds the
S, L, and S so that this is more apparent.
Merge pull request #6975 from terminalmage/docs

Better way of emphasizing S, L, and S in docs
Replaced range(len(collection)) with enumerate(collection)
Replaced insufficient for loop with map
Fixed parentheses
Merge pull request #6970 from terminalmage/symlink-fix

Use the running user and default group for symlink ownership
Merge pull request #6974 from terminalmage/fileserver-fix

Fix exception caught when mtime_map parent dir does not exist
Audit module documentation (S)

This commit continues the work started in 7d4739d, putting CLI examples
in bash code-blocks to give them syntax highlighting on
docs.saltstack.com.
Merge pull request #6980 from terminalmage/docs

Audit module documentation (S)
Merge pull request #6953 from s0undt3ch/features/even-more-logging-power

Support External Logging Handlers