Allow Images in Docs to render inline [1/2]

This small change allows documentation writers to include images
in their doc pages simply by using the  syntax.

This doc practice is documented in the formatting.md page that is
already committed.

I also moved the docs to be a child of the devguide rather than UI
information.


 .gitignore                                         |    3 +-
 .../app/controllers/docs_controller.rb             |   22 ++++-
 .../app/models/crowbar/attrib_instance_default.rb  |   64 +++++++++++++
 crowbar_framework/app/models/doc.rb                |    4 +-
 crowbar_framework/db/crowbar_jig_classes.dia       |  Bin 5867 -> 0 bytes
 crowbar_framework/db/crowbar_jig_classes.png       |  Bin 57948 -> 0 bytes
 doc/devguide/documentation.md                      |  101 ++++++++++++++++++++
 doc/devguide/documentation/formatting.md           |   48 ++++++++++
 doc/devguide/model/crowbar_jig_classes.dia         |  Bin 0 -> 5867 bytes
 doc/devguide/model/crowbar_jig_classes.png         |  Bin 0 -> 57948 bytes
 doc/devguide/model/crowbar_model.dia               |  Bin 2337 -> 3137 bytes
 doc/devguide/model/crowbar_model.md                |    4 +-
 doc/devguide/ui/documentation.md                   |  101 --------------------
 doc/devguide/ui/documentation/formatting.md        |   48 ----------
 14 files changed, 236 insertions(+), 159 deletions(-)

Crowbar-Pull-ID: f9b1f81ad8f45c03928d7b816b2879b540b01057

Crowbar-Release: development