Add/tiny single react ui as a squashed commit based on PR #275 and #285

[intronic]

We decided to move the code from #275 and #285 directly to the new master. Original description below.

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Hi all, we have a prototype going for #229.

What is in the demo:

• One single instance of tiny with the UI in React+Redux, with CSS modules
• The UI is per Behaviour of contextual toolbars during scrolling and editing of documents #215

What works
Block Menu

• clicking in a block will highlight the outer border of the block, and bring up a block-change menu icon at the top right.
• clicking in different blocks brings up the menu for that block
• hover over different blocks highlights that block with a vertical bar, but doesnt change the focus
• hover over the block-change icon and the block-align menu will show
• click the block-change icon and a drop-down of different block types will be shown
• the block-menu icon changes depending on the type of block (currently only P/H/Blockquote - not IMG, etc)

Inline style Menu

• the inline menu shows up only when a range is selected and it appears above the selected text (similar to medium)
• the inline menu button states show the state of the highlighted text (eg, bold)
• using the keyboard to toggle the highlight text bold or italic will also toggle the button states

Key difference in the code

• UI actions, UI state transitions, and UI rendering, and styling are all decoupled so changing the UI is simpler
• Most of the issues in Prototypes: Requirements #190 will be addressed once all the editor actions are linked up, as contenteditable is controlled by a single instance of TinyMCE

What is not completed yet

• linking the button click handlers to the tiny commands (eg, none of the buttons are functional)
• positioning the block highlight after scrolling the page
• the original spec called for the inline menu to be black with white text to distinguish it from the block-menu, but it currently is still white background and black text
• lots of other stuff

Cheers,

Mike, Maurizio & Anna

[jasmussen]

I added the built files, and going to merge this in!