adding peptide and spectrum identification count terms

[mwalzer]

resolves #116

[mobiusklein]

Looks good to me.

[edeutsch]

This looks pretty good, I have a few nitpicky things:

1. Although the first time name is "count of identified peptides", the definition is "peptidoforms". This is thus ambiguous. Elsewhere in the CV we try to draw the distinction between "distinct peptide sequences" and "distinct peptidoforms" (which include mass mods). I suggest making the term name and definition match.

2. In both terms, it seems a little odd that the names are "...identified..." but the definitions are "...identified and pass threshold..." Maybe if would clearer if the definitions were:

"The number of xxxxxxxxxxx that pass the threshold to be considered identified with sufficient confidence."

[edeutsch]

nice, thanks!