v1.x-1.1.1

Bugfix and mainenance release

• Issue #46: Update TinyMCE to 6.7.3 by @indigoxela in #47
• Issue #48: Restructure for code readability by @indigoxela in #49
• Issue #50: Also show notification for non-fatal upload messages by @indigoxela in #51
• Issue #52: Do not remove figure with content by @indigoxela in #53
• Issue #54: Strip tags from image validation messages for notifications by @indigoxela in #55
• Issue #56: Firefox and floated images and dragging or replacing by @indigoxela in #57

Full Changelog: 1.x-1.1.0...1.x-1.1.1