Bump the version to 0.2.3.

Change-Id: Ieb5f9bf3d3f32faf090e91ec9015bd1dc10ba46f

Merge pull request google#78 from google/bump_0.2.2

Bump version to 0.2.2

Bump version to 0.2.1

Bump version to 0.2.0

Change-Id: I1b1950ba952a6c2ad22bffe426e2a6ebcb84abb6

Bump the version to 0.1.3

Bump version to 0.1.2

Change-Id: I397a83d3fa2dc268705df8855b0c567fca3f2fc4

Merge pull request google#12 from google/bump_version

Bump maven version to 0.1.1