raise error on any resource warning left.
Merge pull request #35 from fizyk/close_resources

raise error on any resource warning left.
Update CHANGES.rst
if Executor.stop() was called on a process that had ended, an exception was being raised
an executor that waits for a given file to exist
tests for PidExecutor
documentation for PidExecutor
fixed build errors (to confirm with pep257)
Merge pull request #37 from mruwnik/master

PidExecutor - an executor that waits for the specified file to exist
few PidExecutor tests optimisations
Changelog update
Merge pull request #38 from fizyk/pid_tests

few PidExecutor tests optimisations
Added missing package classifiers
use super for calling parent methods - closes #33
Merge pull request #39 from fizyk/super

use super for calling parent methods - closes #33
badges update