Add stripslashes() wrapper to SSL Seal output

This prevents extra backslashes from being added to various characters.
Updated PayPal IPN to use HTTP 1.1 and "Connection: Close" per recent PayPal IPN updates.
Finishing Preliminary 2Checkout Integration

Added cancel() function as well as trial functionality and error
messages if membership levels were configured improperly.
Merge pull request #69 from scottsousa/dev

Add stripslashes() wrapper to SSL Seal output
Italian language files.
* Updated PayPal IPN to use HTTP 1.1 and "Connection: Close" per recent PayPal IPN updates.
* Fixed bug with slashes being added to the SSL Seal text when Payment Settings are saved.
* Now applying the pmpro_checkout_level filter when a membership level is loaded from an order during the review step with PayPal Express checkouts. This will fix many customizations that might have not worked with PayPal Express.
* Change the use_ssl payment setting. You can choose "No" now for gateways that require SSL. Just make sure you set it to Yes when going live or use another method to force SSL on your checkout page. You can also set it to Yes (use JavaScript redirect) to fix some issues that come up with infinite redirects on shared hosting with specific caching/proxy techniques.
Merge branch 'dev' of github.com:strangerstudios/paid-memberships-pro into dev
Update memberships.php
Merge pull request #71 from mirkolofio/dev

Italian language files.
Fixed admin email on free level checkouts.
Merge branch 'dev' of github.com:strangerstudios/paid-memberships-pro into dev
Added notice to the top of the page.
Fix in crons.php where in rare cases the pmpro_expiration_notice meta was not being set correctly for users, which might lead to multiple expiration warning emails.# Please enter the commit message for your changes. Lines starting
Now redirecting from /register/ to PMPro levels page when latest versions of Theme My Login are activated. Can still disable by returning false with the pmpro_register_redirect or pmpro_login_redirect filter.
Optimized the members list and orders CSV exports to run with less memory. Especially important for large sites.
Removed a die() debug that was introduced into https.php last commit.
Updated pmpro_next_payment to work for any cycle number or period. (Thanks, antonv and others.)
Cleaned up PayPal Express API integration a bit. Fixes some bugs on sites with one-time payments and taxes calculated in.
Now checking for a logged in user before trying to get a billing address to prepopulate at checkout.
* Added some currencies: CNY, INR, IDR, KRW, TRY, VND, ZAR
* All currencies now available to all gateways. You still need to make sure that your gateway supports the chosen currency.
* All currencies now available to all gateways. You still need to make sure that your gateway supports the chosen currency.