Remove redundant explaining text from study show view

- Its quite obvious that we are showing the techniques count so no need
  to explicitly state that.
Fix outdated tests for the study show view

- Some text in the view had been removed and the tests was not up to
  date
Springify bin stubs

- Makes consectutive tests runs faster
Make cacher parameter to Cacher#initialize optional

- This makes the method easier to use when we don't need to specify
  which caching store to use. This is case in the actual implementation
  code.