use lager:limited_fmt/3 if available
remove riak_err_handler references, update readme
lager_format:format/4 is a more appropriate function
Merge pull request #13 from basho/jc-lager

use lager_format:format/4 if available
Use tools.mk Makefile
Update tools.mk
Merge pull request #14 from basho/feature/tools.mk

Use tools.mk Makefile
Change app.src to vsn against git
Merge branch '2.0'