rename files
replace td-agent/fluent/fluentd -> yamabiko
udpate Author
postinstall fluent-plugin-mysql-replicator
Grep reports BUILDROOT inside our object files

ref. http://code.haskell.org/timber/timberc.spec
update git checkout argument

don't show message to suggest 'you are not anywhere' of git
do not overwrite config
libyaml-devel is required to build Ruby
update README