v1.5.3-debug: Save tumblr response when unmarshaling fails

Saving tumblr's response, post-trim, to see what's going on.

v1.5.3

Improved downloader startup time.
Added pre-1.5 command line flags.

Occasionally think that it may be worth it to go back to a pre-hardlink architecture to speed up the startup time.

Halp.

1.5.2: Fix "Unmarshal: invalid character ';' after top-level value" error

Tumblr API added an extra newline to the JSON request. This change
lops that off.

TODO: Actually check for the last '}' character and trim to there.

Resolves #35 for now.

v1.5.1

Slight fix to video parsing to fix being able to download videos.

v1.5.0

Add hardlinking. This allows saving space at the cost of extra memory needed to track each file while downloading.

Add config file for frequently-similar options.

v1.4.1: Mostly refactoring changes.

Bugfix involving download not working.

Gfycat files will now be renamed appropriately. #19

v1.4.0

Added progress bar, download directory, summary, server mode, and version tracker.

Reduced CPU usage and improved speed.

Fixed problem involving saving the last post ID downloaded.

v1.3.2

Bugfix involving video parsing and downloading

v1.3.1

Fixed a bug where files weren't properly detected before download, causing a redownload of everything

v1.3.0

Added video downloading functionality, and increased default speed.