updated documentation for clarity.
fixed a small spelling error I noticed while reading through things
Merge pull request #1728 from carldanley/master

Small docs fixes
Correct dates in chagelog
Merge branch 'master' of github.com:easydigitaldownloads/Easy-Digital-Downloads
fixed a problem with missing parameters on the PHPDoc for `get_sales()`
fixed some missing parameters for `get_earnings()`
Fixed missing parameters in PHPDocs for `get_best_selling()`
forced floatval() parsing. was receiving warning in PHPStorm without it because of relying on adding 2 strings together. it's better to be explicit than letting the intepreter decide.
fixed a missing parameter for `__construct` and removed unnecessary @return's in the PHPDocs
Added a missing parameter for the `edd_increase_total_earnings` PHPDoc
added a missing parameter to the PHPDoc for `edd_decrease_total_earnings()`
Add IDs to profile editor legends
add filter for edd_downloadable_files
Merge pull request #1731 from ghost1227/issue/1715

Add IDs to profile editor legends
Merge pull request #1729 from carldanley/master

Fixed payment documentation
Fix for some sites that encode entities in the PayPal redirect
Merge branch 'master' of github.com:easydigitaldownloads/Easy-Digital-Downloads
Send the number of products with tracking data. Closes #1733
Add note about newsletter optin. #1733