Adding "voltdbroot" to .gitignore.
Adding "voltdbroot" to .gitignore.

kumarrus/voltdb,VoltDB/voltdb,kumarrus/voltdb,flybird119/voltdb,simonzhangsm/voltdb,migue/voltdb,kumarrus/voltdb,creative-quant/voltdb,wolffcm/voltdb,deerwalk/voltdb,wolffcm/voltdb,VoltDB/voltdb,wolffcm/voltdb,ingted/voltdb,simonzhangsm/voltdb,kobronson/cs-voltdb,VoltDB/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,ingted/voltdb,ingted/voltdb,zuowang/voltdb,ingted/voltdb,ingted/voltdb,simonzhangsm/voltdb,kobronson/cs-voltdb,kobronson/cs-voltdb,paulmartel/voltdb,kumarrus/voltdb,migue/voltdb,wolffcm/voltdb,kumarrus/voltdb,kobronson/cs-voltdb,deerwalk/voltdb,zuowang/voltdb,migue/voltdb,zuowang/voltdb,VoltDB/voltdb,kumarrus/voltdb,VoltDB/voltdb,migue/voltdb,paulmartel/voltdb,kobronson/cs-voltdb,kumarrus/voltdb,creative-quant/voltdb,flybird119/voltdb,zuowang/voltdb,VoltDB/voltdb,creative-quant/voltdb,creative-quant/voltdb,kobronson/cs-voltdb,migue/voltdb,kumarrus/voltdb,deerwalk/voltdb,ingted/voltdb,zuowang/voltdb,VoltDB/voltdb,paulmartel/voltdb,flybird119/voltdb,flybird119/voltdb,migue/voltdb,flybird119/voltdb,paulmartel/voltdb,zuowang/voltdb,paulmartel/voltdb,wolffcm/voltdb,wolffcm/voltdb,migue/voltdb,simonzhangsm/voltdb,flybird119/voltdb,creative-quant/voltdb,flybird119/voltdb,zuowang/voltdb,ingted/voltdb,deerwalk/voltdb,wolffcm/voltdb,zuowang/voltdb,paulmartel/voltdb,flybird119/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,deerwalk/voltdb,kobronson/cs-voltdb,paulmartel/voltdb,wolffcm/voltdb,creative-quant/voltdb,simonzhangsm/voltdb,creative-quant/voltdb,kobronson/cs-voltdb,simonzhangsm/voltdb,ingted/voltdb,deerwalk/voltdb,creative-quant/voltdb,migue/voltdb