cylc.task_pool.pool.process: fix attribute error.
doc/make-index.sh: use "cylc --version" ...

... to generate the version string.
Merge pull request #232 from matthewrmshin/doc-make-index.cylc-version

doc/make-index.sh: use "cylc --version" ...
Merge pull request #230 from matthewrmshin/cylc.task_pool.process.state.submitting

cylc.task_pool.pool.process: fix attribute error.