Temporarily disallow PDFBox 3.0.0 because of incompatible changes to …

…command-line interface (#26).

Rewrite arg handling to handle file names with spaces (#15).

Merge.

Update authors.

Tweak.

Exclude pyc files in MANIFEST.in.

Set parents=True when attempting to create cache dir (#4).

Remove -force option as it longer appears to be supported (#1).

Add Makefile.

Update to PDFBox 2.0.10, use sha512 verification, bump version.