anchor popup attribute missing

Please add the menubar attribute to anchor popup
Fix #3161
Fix #3160
Update url_helper.php
Support for menubar attribute to the :func:`anchor_popup()` 

Now the menubar can be set to yes with anchor_popup() by adding new attribute array element 'menubar' => 'yes' 
The list of all available attribute for anchor_popup() function will be 
$atts = array('width' => '800', 'height' => '600', 'scrollbars' => 'yes', 'menubar' => 'no', 'status' => 'yes', 'resizable' => 'yes', 'screenx' => '0', 'screeny' => '0');
Update url_helper.php
Update url_helper.php
Last empty line remove
Merge pull request #3162 from MianSaleem/patch-1

anchor popup's menubar attribute is missing
Make CI_Pagination properties per_page, cur_page public

Useful if you want to make calculations based on them.
Fix #3123
Change name didn't work if reset initialization it's true

If user initializes the upload library with the reset flag as true, the
uploaded file doesn't change it's name, it's neccesary to initialize or
change the $_file_name_override every time.
Merge pull request #3169 from Patroklo/develop

Change name didn't work if reset initialization it's true
Using ImagePNG in CAPTCHA helper
Using ImagePNG function, if ImageJPG not exists
Merge pull request #3173 from ET-NiK/develop

Using ImagePNG in CAPTCHA helper
Polish changes following PR #3173
CSRF whitelist supports regex

Signed-off-by: Casey Hancock <crh431@gmail.com>
Cache_redis: Adding serialization support.
Skip CI_Encrypt tests if MCrypt is not available

Rel: #3185
Fix #3187