Single exercise page, tests working and changes in files structure

Now It's possible access single exercises using their id, the
exercises in the full exercises list now have a unique link.

Previously two different javascript main files were generated to
be used in production and test, with differents adapters (REST or
localstorage). Now the adapter depends of and global variable,
so just one main file of app is generated and used for both
propouses.
Merge pull request #37 from MateusZitelli/wip/ember_migration

Single exercise page, tests working and changes in files structure