Revert "Use the 10.9 bindist for 10.10 for now."

This reverts commit 393cfeffe146baba823f1b2578c0e5cf593fe66b.
Use explicit quoting.
Reflow some text.
Do not ask pkgutil about java since java induces headaches.

There are at least three different complete java systems that could be installed, all with different names and some which swap names in different osx versions.
Be a bit clearer in the xcode tools exit message.
Fix spelling.
hdiutil has become more verbose.
Make hdiutil a bit quieter.
If it does not have a mount point we are not interested.
If you do not have xcode you do not have to agree to the licence.
Make sure we actually check for the right thing.
Merge pull request #26 from dak180/topic/setup

Topic/setup