Release 5.1

* Release v5.1
* Added brand new templating framework, to allow users to
create custom form templates for use with any MailChimp List
* Re-style
Manage List page
* Added missing label to radio buttons inside the
form
* Added missing closing parentheses on subscriber count inside view
subscribers page
* Added custom color picker to easily stylize forms
without writing a single line of code
* Added ability to specify a
custom class names for each field of the form ( easily add custom class
names to MailChimp form fields for further customization )
* Only run
API Key check when a new key is entered ( not on each page load )
*
Added new Welcome page with features+update notifications for users
*
Security vulnerability re-patched - props @g0blinResearch for privately
disclosing the potential vulnerability
* Added
`yks_redirect_add_post_types` filter, to allow custom post types to be
added to the redirect drop down (view
[docs](https://wordpress.org/plugins/yikes-inc-easy-mailchimp-extender/other_notes/)
for example)
* Added `yikes_mc_user_already_subscribed` filter to allow
users to alter the message displayed to the user when they are already
subscribed to a given list (view
[docs](https://wordpress.org/plugins/yikes-inc-easy-mailchimp-extender/other_notes/)
for example)
* Added `yikes_mc_subscriber_update_message` filter, to
alter the success message when a user updates their account information
for a given list (view
[docs](https://wordpress.org/plugins/yikes-inc-easy-mailchimp-extender/other_notes/)
for example)
* Added a new link to allow users to update profile
information if previously subscribed to a given list
* Added 5 bundled
templates, and 2 boilerplate files for users to use as a starting point
for new templates