bump Zlib version and make ZipFile use it
Merge pull request #332 from fhs/ZipFile

bump Zlib version and make ZipFile use it
MixtureModels version 0.1.1
Bump ODBC sha1
Bump Datetime sha1 and delete Datetime2 package
update ZMQ and JSON urls -- now under JuliaLang.
Bump BinDeps
Add Optim v0.1.6