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.
It seems like CDI is a bad guy and disrupts your life. I'd change this for something like: `Para melhorar a testabilidade de suas classes aconselhamos injeção de dependências por construtor. Dessa forma você pode trabalhar com mocks facilmente, como por exemplo: `. And provide a simple code example.