Big refactor of the plugin and new options addition

[elchininet]

This pull request refactors a big part of the plugin and adds several new options.

New configuration options

Property	Type	Required	Description
title_color*	String	no	Sets the color of the sidebar title
sidebar_color*	String	no	Sets the color of the sidebar
sidebar_button_color*	String	no	Sets the color of the sidebar hamburger menu
icon_color*	String	no	Sets the color of the sidebar icons
icon_color_selected*	String	no	Sets the icon color of the selected sidebar item
text_color*	String	no	Sets the text color of the sidebar items
text_color_selected*	String	no	Sets the text color of the selected sidebar item
selection_color*	String	no	Sets the color of the selected item background. If it is not specified, the icon_color_selected will be used (this color has an opacity of 0.12)
info_color*	String	no	Sets the color of the info texts of the sidebar items
info_color_selected*	String	no	Sets the color of the info text of the selected sidebar item
notification_color*	String	no	Sets the color of the sidebar notifications

* These options allow JavaScript or Jinja templates.

New order items properties

Property	Type	Required	Description
info*	String	no	Sets the content of the info text (a smaller secondary text below the main item text)
icon_color*	String	no	Sets the color of the icon (it overrides the global icon_color)
icon_color_selected*	String	no	Sets the icon color of the item when it is selected (it overrides the global icon_color_selected)
text_color*	String	no	Sets the text color of the item (it overrides the global text_color)
text_color_selected*	String	no	Sets the text color of the item when it is selected (it overrides the global text_color_selected)
selection_color*	String	no	Sets the color of the item background when it is selected. If it is not specified, the icon_color_selected will be used (this color has an opacity of 0.12 and it overrides the global selection_color)
info_color*	String	no	Sets the color of the info text (it overrides the global info_color)
info_color_selected*	String	no	Sets the color of the info text when the item is selected (it overrides the global info_color_selected)
notification_color*	String	no	Sets the notification color (it overrides the global notification_color)

* These item properties allow JavaScript or Jinja templates.

New exceptions options

You can define user-specific options using exceptions feature. Exceptions can be used if you would like to define different options for a specific user/device.

Property	Type	Required	Description
title_color*	String	no	Sets the color of the sidebar title
sidebar_color*	String	no	Sets the color of the sidebar
sidebar_button_color*	String	no	Sets the color of the sidebar hamburger menu
icon_color*	String	no	Sets the color of the sidebar icons
icon_color_selected*	String	no	Sets the icon color of the selected sidebar item
text_color*	String	no	Sets the text color of the sidebar items
text_color_selected*	String	no	Sets the text color of the selected sidebar item
selection_color*	String	no	Sets the color of the selected item background. If it is not specified, the icon_color_selected will be used (this color has an opacity of 0.12)
info_color*	String	no	Sets the color of the info texts of the sidebar items
info_color_selected*	String	no	Sets the color of the info text of the selected sidebar item
notification_color*	String	no	Sets the color of the sidebar notifications

* These options and item properties allow JavaScript or Jinja templates.

[coveralls]

coverage: 99.765% (-0.006%) from 99.771%
when pulling 9e5ce20 on add_new_options
into fcada91 on master.