Avoid repeated parser lookup

Before this commit we had to iterate over social networks array
twice. Using parser class as a key speeds up the lookup
as we don't need to iterate over this array again and again.
Add missing specs for IdsPlease#recognized
Restore `recognized` behavior returning sym keys
Add missing specs for IdsPlease#unrecognized
Add missing spec for IdsPlease#original
Merge pull request #3 from splattael/speedup

Refactor and speed up