Add offline documentation.
Reword intro.
Add offline config to navigation.
Add a warning about the charm payloads being offline.
Clarify installation instructions.
Fix link to Cloud Images in Config Vagrant section
Merge pull request #110 from rogeriopradoj/patch-1

Fix link to Cloud Images in Config Vagrant section
Merge pull request #109 from castrojo/offline-charms

Add offline documentation.
Update glossary.md

remove artefacts of HTML->md conversion
added 1.18.3 release notes
added 1.18.2 release notes
fix spelling typo
Merge pull request #111 from mikemccracken/patch-1

fix typo
Adding more information on the relation-ids command.
Merge pull request #113 from mbruzek/relation-ids

Adding more information on the relation-ids command.
unclear information 

it was not obvious immediately where is Ubuntu, Mac OSX and Windows specific information
remove excessive info
cleanup
Merge pull request #114 from tyloch/patch-3

fix mac/win/linux headers
added meta parsing

added meta parsing extension. This does nothing to files which have no metadata, but is important for filtering out metadata when it gets added.