Add a Formula for voltdb.
Fix dependency on ant against failure in \"brew readall\" test on Jenkins.
Add a simple test and use system default ant.
Avoid installing *.jar files just under lib directory to fill the requirements of brew audit.
Fix a bug in the test.
Add modification of bin/voltdb script.
Fix some insufficient codes.
Remove unneeded symlink. The path of "extention" directory was already relocated in the inreplaced bin/voltdb shell script.
Fix a misuse of inreplace method, use an assert method in the test block, put the arguments of prefix.install together and arrange some codes.
Replace the path of documents following the original package.
Merge branch 'voltdb' into develop