docs(minErr): Build minErr doc site

The minErr doc site is ready for review. 

Changes in this PR:

- Include ngdoc files for each minErr that we throw in angular core
- Extend ngdoc parser to handle new ngdoc type
- Rearrange page headers for ALL of docs.angularjs.org
    - The "view source" and "improve this doc" buttons have been moved above the header
    - The module note has been moved from a h1 level span to a subheading
    - This was done because minErr pages tend to have longer headers
- Add `minerrDisplay` attribute directive to interpolate minErr parameters
- Display minErr types in namespaces under docs.angularjs.org/minerr/ (like API modules)
- Add rewrite rule to make /minerr/ accessible from `grunt webserver`