add "" to echo , [[ =~ ]]

Change-Id: I13fced3cf0de7c8533889d713de37bba3b193380
add to_lower.sh

Change-Id: Ieaa0d4d82d8d111e4453c9c5d624de08cff879a7
rename git_info.sh to gitinfo.sh

Change-Id: Idd20caf9a58acaa13d78337f8181645cfb8e30e4