Fix small (but annoying) bugs

[et304383]

• solr data dir creation should be recursive
• attempting to start solr when the PID file exists should not throw an error

[et304383]

What's wrong with this PR? Why can't it be merged? The Travis failure is not related.

[dwradcliffe]

Sorry, just been busy. I'll try to look at this today!

[dwradcliffe]

Released in 0.1.4.

[et304383]

Thanks so much!