added tracer to handle Meteor tracing
split networkImpact to two parts as:
 * bytesBeforeReady - data transfered from cursor directly. before calling ready
 * bytesAfterReady  - data transfered as a result of observations. after calling ready
added tracing support for observe and observeChanges
add tracking support for rewind in the cursor
added cursor: true
Merge branch 'tracing' into rec-v1
added to wrap_session
updated hijack code with the tracer
removed Notification Manager and replaced with tracer
Merge branch 'integrate-tracer' into rec-v1
tracer now accepets session as the argument to take userId & both sessionId
added outlier limits
median absolute deviation based outlier selection algorithm added to pick traces
more sanity checks
error handling and the refactored tracer store
integrated tracerStore to the methodsModel
send methods by every 5 min
Merge branch 'tracer-store' into rec-v1
fixed some code level issues
added support for tracing pubsub as well