remove example caml4p invocation
typos in README and more markdown formatting to look better on Github
fix a serious internal problem that happen the traversal of an already compiled directory.

need to mark the task as finish in the DAG, before Retrying. otherwise the
taskdep is never complete, as it's missing a task.
add a helper to get internal library dependencies.
consider internal libraries mtimes when building modules. fixes #4.
don't consider hidden files (starting with .) as valid obuild files.

fixes #6.
Merge github.com:/avsm/obuild
add a test block test
make sure we load the global state before reading the project file.
make sure tests are buildable if it set.
implement a basic test subcommand. fixes #7.
add design to the list of sdist files.