v1.5.0

• Feature: Search.
• Feature: CSRF protection.
• Feature: Page deletion.
• Feature: Emoji.
• Feature: TSV parser for code block.
• Feature: Page teamplte builder.
• Feature: Preview scroll sync.
• Improve: Page header highlighting.
• Improve: Changed icons and colors of for popular pages on page list.
• Improve: New page dialog.
• Fix: Couldn't create some page name like /meeting (Thank you @kazsw #100).
• Removed Feature: Facebook login feature is now removed.
• And some fixes. (Thank you @suzuki @xcezx)