feat #28 Adding the possibility to use placeholders for snippets and samples url

Using a placeholder you won't care anymore to change it in order to use the local version or the prod version.
fix #31 Updating source files

This commit replaces all the harcoded url we have inside the source files with a predefined pattern that will be replaced automatically with the proper url (prod or localhost).
Adding sample for aria:List

Adding a sample to document how the widget work when items property is bound to the data model.
Rest API: formatting

Close #19.
TOC improvements

1) Highlight current file in the dropdown
2) Make dropdown expand also from keyboard
3) Display links in TOC as block so they get 100% width

Close #18.
Update gitignore

Ignore Eclipse .settings folder
partial revert of TOC/sidebar commits

They seemed to work locally for me but are failing on AT.com
Article still mentioning expandos
Added a warning note about modifier functions.

I explained that modifier functions are not directly accessible when using the Modifier class, but only through its method callModifier.
Merge pull request #51 from ymeine/pr/fix/templates/modifiers/warning-note

Added a warning note about modifier functions.
Merge pull request #28 from fab-b/placeholder_for_snippets

Adding the possibility to use placeholders for snippets and samples url
Merge branch 'updating_md_files_for_placeholder' of https://github.com/fab-b/usermanual into fab-b-updating_md_files_for_placeholder

Conflicts:
	src/latest/templates/advanced/dom_events.md
Changed default URL replacement to point to GH
Merge branch 'list_doc' of https://github.com/fab-b/usermanual into fab-b-list_doc

Conflicts:
	src/latest/widgets/aria_widgets_lib/list.md
(fix) reverting node_env usage to be 'development' the default
Merge pull request #57 from benouat/nodeEnvRevert

Revert NODE_ENV usage in snippet server url replacement
Adding all the missing releases from 1.4.13
Merge pull request #58 from benouat/missingReleases

Adding all the missing releases from 1.4.13
Adding documentation for imgUrlMapping property for CSS templates
bumping new version 1.4.16