Remove accidentally-committed binary

Signed-off-by: Casey Dahlin <casey.dahlin@gmail.com>
Documente --enable-lcov config option

Signed-off-by: Casey Dahlin <casey.dahlin@gmail.com>
Remove value constructors from public API

The standard way for a user to get an ASON value is now ason_read. We won't
have the constructors anymore.

Signed-off-by: Casey Dahlin <casey.dahlin@gmail.com>