Restored FilenameUtils from apache.
Removing warnings (potential errors).
Split 'common/' into commit 'e0fc14fffc4c958cd28401e562f9a808bdab07d2'

git-subtree-dir: common
git-subtree-mainline: a0b06b800d235e562a13f65a74204d86f4e96adb
git-subtree-split: e0fc14fffc4c958cd28401e562f9a808bdab07d2