Avoid object to throw incorrect exception for integerish
Bump minor version to 2.1.x-dev
Passed message to sprintf() to make it parameterizable
Merge pull request #74 from simensen/master

Bump minor version to 2.1.x-dev
Merge pull request #76 from webmozart/issue16

Passed message to sprintf() to make it parameterizable
Merge PR #71
Fix generated doc blocks.