Fix current artist and album opening page "Not found"
grunt.js is no more used
Move jshint instructions from Gruntfile to .jshintrc + .js
- Thus allowing `jshint` to work in standalone for each .js
- This also removes lint errors when generating stats with `plato`
- Cleanup of global variables declared in .jshintrc vs inside files
- Added plato.sh (proper exclusion filters and parameters)