Added last activity data to IRC needed for tendencies.

Conflicts:
	vizGrimoireJS/irc-analysis.R
	vizgrimoire/R/IRC.R
Removed not valid comment.
Added last activity and tendencies functions.
Remove lastActivy and generated this metrics from GetDiffs functions.
Added tendencies to SCR

Conflicts:
	vizGrimoireJS/scr-analysis.R
	vizgrimoire/R/SCR.R
Fixed how pending global is computed.
EvolReviewsPendingChanges returns no metrics if changes does not include new, merged, abandoned events.

Conflicts:
	vizGrimoireJS/scr-analysis.R
Removed not valid comment anymore
Fixed not finished merge conflict.