Merge branch 'develop'

* develop: (62 commits)
  Add CHANGELOG
  Update readme
  Fix docs
  Document
  Rename reorder to calculate
  Annotate main function
  Add metadata to Cargo.toml
  Move modules to files
  Move extra module to top level
  Split out helpers into modules
  Handle required/optional filenames correctly
  Load options using structopt
  Move test in bin to actual test
  Add structopt
  Split pdf handling into separate module
  Make new page from all but contents, rather than just contents
  Strip testing printlns
  Change interface for set_pages_dict to ensure a Vec is supplied
  Fix set_pages_dict
  Implement get_object_mut as trait
  ...

CHANGELOG.md

@@ -0,0 +1,5 @@
+# Changelog
+
+## [0.1.0] — 2018-01-10
+
+-   Initial version