Enable cmake tests.

There aren't any tests yet, but there will be.
Merge pull request #83 from ahmedcharles/testing

Enable cmake tests.
Have HostPool delete Hosts when they are removed.
Fix memory leak in TMap.
Merge pull request #96 from ahmedcharles/hostpool_leak

Have HostPool delete Hosts when they are removed.
Merge pull request #95 from ahmedcharles/tmap_leak

Fix memory leak in TMap.
Some more intentionally low controversial formatting.
Merge pull request #89 from ahmedcharles/clang_format

Some more intentionally low controversial formatting.
Remove unused function from TTreeWidgetItem.h/cpp.