docs(tutorial/step_05): apply more useful link to services
style(ngRepeat): fix typos
docs(guide/e2e-testing): fix verb tense
docs($q): fix a few issues
docs(select): fix typos in ngOptions
docs(guide/di): fix headings hierarchy
feat(Grunt): add source maps to all min files

Generate source map files when build step is ran and adds source map
headers to all min files.

Source map url must be appended to the min file otherwise the line
offsets will be off.

Inspired by Ryan Seddon (PR #2858)

Closes #1714