Removed `composer.json.bak`.

It is identical to the current `composer.json` file.
Added configuration store for metadata API services.
Modified `MetadataParser::getSummaryFromTrakt()` to make use of new metadata configuration values.
Merge branch 'master' of https://github.com/alanly/thedrop into develop
Added `force secure` configuration variable to allow user modifiable behavior.
Improved implementation of secure redirection filter.

The coding is more verbose to allow for easier modifications.
Implemented sanitization for "pretty filename" in order to check for invalid filename characters (such as slashes).
Fixed implementation of "force_secure".
Reduced unnecessary call for force_secure if the request is already secure.
Fixed typo in statement.
Fixed logic error in force_secure.
Added sanitization for unicode characters.
Updated donation crypto addresses.
Pretty filename may not always be determinable.
Merge branch 'master' of https://github.com/alanly/thedrop into develop