scope: introduce phantomas.emit()
domQueries: make use of phantomas.emit()
eventListeners: phantomas.incr() -> phantomas.incrMetric()
domComplexity/: phantomas.incr() -> phantomas.incrMetric()
Public API cleanup

* phantomas: remove setMetricFromScope and getFromScope methods
* scope: remove set, get and incr methods
Merge pull request #321 from macbre/internal-api-cleanup

Internal api cleanup