Made blog posts in-line editable.
* New feature: Table::execute_model() - Execute single with automatic empty model creation.
* Textual content on blog pages is now in-line editable.
* Updated JSLite to version 0.4.0.
* Several bug fixes:
  * Clicking on "edit this page" takes you to the editable home page.
  * Weird errors when validation of time line update data fails.