* updated all json API descriptions
* enabled 'pretty' printing of response structures. However, currently
there is no way to get rid of all the NULL fields without external
filtering
* all structure fields are now optional - there seems to be no way
around it.
Fixes#73
* keywords are no longer than 20 characters, which is a restriction
cargo imposes
* don't use 'homepage' link in cargo.toml unless the homepage is
non-empty
* Added all publish-results to mark the respective crate version
Related to #46