added `errorOnFail` option (defaulting to false) and logic to return an error to the stream that will allow for failing the overall gulp task.
updated README.md to document the new `errorOnFail` option.
Merge pull request #4 from keithmorris/develop

Develop
Version bump
Rewrote gulp-msbuild
Added Node 0.11 to Travis.yml
Enhanced command builder tests
Added hint to the configuration option

The Build Configuration can also be specified in the properties option
Added link to MSBuild Command-Line Reference
Added Possible Values to verbosity option
Fixed Typos in README
Version bump