Merge pull request #680 from randyzwitch/metadata-v2

Register Twitter: v0.0.1, v0.0.2
Tag GitHub v0.0.2
Merge branch 'metadata-v2' of git://github.com/JuliaLang/METADATA.jl into metadata-v2
Tag GLUT v0.3.0
Merge pull request #681 from rennis250/metadata-v2

Tag GLUT v0.3.0
Tag Arduino v0.1.0
Merge pull request #682 from rennis250/metadata-v2

Tag Arduino v0.1.0
Tag Lazy v0.2.1
Tag HypothesisTests v0.2.5
Tag MAT v0.2.3
Tag PLX v0.0.1
Register ReverseDiffSparse
Tag ReverseDiffSparse v0.0.1
Tag MLBase v0.3.3
Tag NumericExtensions v0.5.5
Tag Distributions v0.4.1
Tag ProtoBuf v0.0.2
Merge pull request #686 from tanmaykm/metadata-v2

Tag ProtoBuf v0.0.2
Merge pull request #684 from mlubin/pull-request/9456bc3c

ReverseDiffSparse: automatic differentiation with sparse hessians
Tag TimeSeries v0.3.7