default_coafile: Add missing values

All these values are needed to operate coala without any IndexError
exceptions.
Setting: Add path_list conversion
BearCollector: Convert directories to paths
FileCollector: Convert directories to paths
Setting: Use only directory of origin

The origin member of the setting holds the originating _file_. Thus we
should strip of the file and take only the directory instead.
CliParser: Use correct origin

Since the CliParser specifies the origin as a directory and the Setting
uses a path to a file we need to append a directory seperator.

If there already is a directory seperator, it won't do any harm because
double directory seperators are usually parsed as one.
Setting: Return absolute path for path conversion
coalib: Use dirname instead of split

This is more efficient and straightforward.
ProcessSpawner: Allow delayed process starting

This is usefull if you work with queues. In this case you'll want to
first create the processes and then fill the queues and finally start
the processes so they'll get the elements.

I didn't fully understand yet why this is necessary but it would be nice
to have this understanding.
processes: Add SectionExecutor
processes: Add SectionExecutorTest
SectionManagerTest add
sectionexecutor instantiate tb ears
sectionmanager test
Sectionmanager bugfix NEEDED