Modified build scripts to accommodate Jenkins

Jenkins can't run openspim.sh, but still needs to get 3rdpartypublic, the
JDK, and Fiji... I moved those fetch bits into prepare-for-build.sh which
is invoked from build.sh; for most users, there won't be much difference,
since openspim.sh calls build.sh anyway.

Signed-off-by: Luke Stuyvenberg <stuyvenberg@wisc.edu>
Merge branch 'openspim' of git://github.com/openspim/micromanager into openspim

Conflicts:
	prepare-for-build.sh