I have been working on Monstra CMS 2.1.0 and I am happy to introduce 
Monstra CMS 2.1.0 :)
It has a lot of improvements and several fixes for known issues. 
Here is a list of major changes: 
- Localization: PT-BR, UK translations added.
 
- Default theme: hook "theme_header" added.
 
- System Plugin: new action "admin_system_extra_index_template_actions" added.
 
- Shortcodes API: new delete() clear() exists() methods added.
// Check if a shortcode has been registered.
if (Shortcode::exists('shortcode_name')) {
    // do something...
}
// Delete shortcode
Shortcode::delete('shortcode_name');
// Remove all registered shortcodes.
Shortcode::clear();
 
- Options API: new exists() method added.
if (Option::exists('pages_limit')) {
    // do something...        
}
 
- Core: new constant VERSION - added.
    const VERSION = '2.1.0';
 
- Core: added ability to load: defines, actions, filters, shortcodes for current environment. 
 boot/
  ├── development/
  │   ├── defines.php
  └── production/
      └── defines.php
 
- Defines: deprecated constants: MONSTRA_GZIP_STYLES, MONSTRA_VERSION, MONSTRA_VERSION_ID, MONSTRA_SITEURL, MONSTRA_MOBILE deleted.
 
- Box Plugins: used Core::VERSION to compare Monstra CMS version.
 
- Installer: use version_compare() function to compare php versions.
 
- Installer: Get system timezone with date_default_timezone_get() function.
 
- Admin Default Theme: general improvements.
 
- Users Plugin: user profile editing fixed.
 
- Shortcodes API: bug with similar shortcode names fixed.
 
- Site: template() method improvements. Added ability to get template from specific theme.
 
- Menu Plugin: added ability to select children pages. 
  
- Snippets Plugin: added ability to add parameters for snippets.
// PHP Code
Snippet::get('test', array('message' => 'Hello World'));
// Shortcode
{snippet get="snippetname" message="Hello World"}
 
- Themes Plugin: added ability to add parameters for chunks. 
// PHP Code
Chunk::get('footer', array('message' => 'Hello World'));
 
- Pages Plugin: pages expand/collapse feature added. 

 
- Pages Plugin: pages "access" feature added.
 
- Pages Plugin: tab "seo" changed to "metadata"
 
- Pages Table: "expand, "access" fields added.
 
- Information Plugin: new "Directory Permissions" tab added.
 
- Twitter Bootstrap updated to Version 2.2.1
 
- MarkitUp! updated to Version 1.1.13
 
- Sitemap Plugin: links title issue fixed.
 
- Core: Init Site module on frontend only.
 
- Core: IDIORM optimization.
 
- Site Class: code optimization.
 
- Sitemap Plugin: bug with priority fixed.
 
- File .gitignore added.
 
- Monstra logo updated.
 
- README: general updates
 
- Pages Plugin: "delete" action fixes.
 
- Plugins Manager: add ability to Cleanup minify with new plugin installation or plugin uninstallation.
 
- MarkitUp Plugin: unnecessary files removed.
 
- XMLDB: select() method fixes.
 
- XMLDB: new method existsField() added.
if ($users->existsField('field_name')) {
    // do something...     
}
 
- Information Plugin: shows "PHP Built On", "Web Server", "WebServer to PHP Interface" information. 

 
- Installer: general fixes.
 
- Snippets Plugin: view embed codes feature added.
 
- Blocks Plugin: view embed codes feature added. 

 
- Text Helper: method strpSlashes() fixed.
 
- Text Helper: new method increment() added.
// Add's _1 to a string or increment the ending number to allow _2, _3, etc
$str = Text::increment($str);
 
- Pages Plugin: method robots() fixes.
 
- Pages Plugin: improved page author detection.
 
- Pages Plugin: add, edit, delete, clone actions improvements.
 
- Users Plugin: apply "content" filter for "about_me" field.
 
- Plugin API: Stylesheet and Javascript load() methods - fixed.
 
- Pages Plugin: Page editing date issue - fixed.
 
- Localization: EN, RU, IT, LT, DE translations fixed.
 
- Imformation Plugin: config file(defines.php) checking removed.
 
- Box Plugins: general code refactoring.
 
Download: monstra-2-1-0.zip
Update to Monstra 2.1.0
- Download monstra-2-1-0.zip
 
- Unzip the contents to a new folder on your local computer.
 
- Upload 
/admin/, /monstra/, /public/assets/, /boot/, /plugins/ and /index.php  with an FTP client to your host. 
- Download update_to_monstra_2_1_0.zip
 
- Unzip the contents of update_to_monstra_2_1_0.zip and upload 
update_to_monstra_2_1_0.php with an FTP client to your host. 
- Type http://example.org/update_to_monstra_2_1_0.php in the browser.
 
GitHub: repository { Follow Me / Fork Me! }
Special thanks to: Stanislav Ulver, Martynas Barzda, Yannick Albert, over9k