Add API docs to README
Add ValidationError to loopback exports.

Simplify the construction of validation errors in user-land code:

    var error = new loopback.ValidationError(invalidModel);
Fix links so they work on apidocs site.
Merge pull request #119 from strongloop/feature/export-validation-error

Add ValidationError to loopback exports.
Add app.restApiRoot setting

Allow loopback users to configure API root via config file, instead of
editing app.js generated by loopback-workspace.

Allow loopback plugins to discover the path where the REST adapter is
mounted.
Merge pull request #123 from strongloop/feature/app-get-api-root

Add app.restApiRoot setting
Bump version
Merge branch 'release/1.4.2' into production