Basic deploy of AngularJs + RequireJs + Bootstrap

AngularJs, RequireJs and Bootstrap have been deployed into the webapp, by
including the dependencies via WebJars. Also, an AssetsController scala file
has been created to unify different package names in controllers (Play's
default "controllers" and mine "es.uvigo.esei.tfg.smartdrugsearch.controller"),
that were causing some weird and ugly inconsistencies both in the Routes config
file and in views.

Also, to also improve consistency, and since Play's generated Scala code from
views use a package name relative to its path (so, if the path was
"src/main/view", it will put it in package "view"), a directory tree of all
packages has been created, and all code moved into it. Note that this tree
structure is not required nor enforced by Scala or Play, as opposed to Java,
and things have been working well without it; it's just done for consistency
with the generated Play's Views code.