turn core.Async from class to namespace
use core.Async.destroyAll for Editor.destroy
Merge pull request #469 from kossebau/makeCoreAsyncANamespace

Make core.Async a namespace
Add fullscreen and presentation support for IE11.

This amazing browser does camelCasing differently
for event names and also does not support the
isFullscreen or msIsFullscreen property on document.

Therefore this commit keeps track of the fullscreen
state with a custom flag, instead of asking the browser
for it.
Hide presentation button when there is no fullscreen api
Merge pull request #472 from adityab/ie-viewer-fullscreen

Viewer: Add fullscreen and presentation support for IE11.
Added unit conversion to ODfUtils

Needed to implement unit conversion and I noticed it had already been
implemented here: https://github.com/kogmbh/WebODF/pull/424
Refactored creation of style tree

Moved the creation of the style tree out of Styles2CSS. This is the first
step in refactoring out and fixing some duplicate list handling code in
OdfCanvas.js.
Refactored application of list styles

Moved the code that parses ODF lists styles and creates rules for them
into a separate object. This is done as the second step in removing
duplicate/redundant code from OdfCanvas.js around some list style
handling.
Implement label-width-and-position mode for list layout

Remove the partial handling of list indentation and implement the default
option for list-level-position-and-space-mode.

http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#property-text_list-level-position-and-space-mode
Implement label-alignment mode for list layout

Add handling for the label-alignment list style element. This commit does
not implement the text:label-followed-by attribute so for now a hard coded
padding has been substituted

http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#__RefHeading__1416522_253892949
Initialise indents and widths to default values

This prevents us from being unable to sum these values together
Remove redundant variables and add further comments
Added some layout tests for list styles

Added one test for label-alignment styling and another test for
label-width-and-position mode