Adding pt doc "Testing Components and Controllers"

I tried to write this doc about "Testing Components and Controllers".
The text I based on discussions on the mailing list and docs from VRaptor3.

Just in portuguese, so when you accept the doc, I can try translate to English.  :smiley: 

Sorry for some possible errors.
DI means english work, and since this is pt doc, I think that `quando fazemos a injeção de dependência via atributo` sounds better.