S3 storage upload fix

bugfix: S3 storage upload error #46

PDF preview fix

• bugfix: broken PDF preview when using "readfile" API method #45

Laravel integration preparations

• extended composer dependencies to support Laravel >= 5.4
• reworked service container instantiation to minimize collisions while Laravel integration

Customizable upload parameter name

• fixed path validation bug at IIS servers #43
• customizable upload parameter name #44

Symlinks outside fileroot solution, Bugfix

• implemented configurable solution to use symlinks that point to files/folders outside fileroot folder #12
• bugfix: error when deleting a file #35
• bugfix (S3 storage): wrong encryption on file move #36
• bugfix (S3 storage): failed thumbnail creation due to double-slash in path #41
• bugfix (Local storage): folder download operation doesn't work #38

Recursive search, Events for operations, API improvements

• implemented events and listeners for API operations #24
• use a single point to calculate filesize across application #25
• avoid spaces and parentheses inserted into a file name while upload #26
• automatically exclude image thumbnails folder from the output #27
• allow double underscores in file names #28
• throw an error if delete operation failed #29
• error response format altered to correspond to JSON API standard #30
• simplified workflow of the "download" method, doesn't require AJAX API extra call anymore #32
• new error handling flow; required HTTP headers; strict JSON API conformity #33
• added new "seekfolder" API method for server-side search operations #34

Bugfix

• added capability to override viewer.absolutePath and viewer.previewUrl client-side options from PHP connector #16
• PHP 5.5.9 is no longer supported, bumped to 5.6.4, updated dependencies #22
• bugfix: failed to create image thumbnails upon upload image into newly created folder #23

Hotfix

bugfix: missed namespaces #10

Storages bugfixing

• compatibility: wrapped functions with RFM namespace #10
• bugfix: (S3 storage) redundant leading slash in S3 object key #18
• bugfix: (S3 storage) error on mkdir and images thumbnail uploading #19
• bugfix: (Local storage) image thumbnails are not being removed upon delete operation #20

S3 encryption

• implemented server-side encryption for S3 storage #14
• rollback forcing absolutePath option in the initiate API method #16
• bugfix: rename operation fails on Local storage #17