Includes an ubuntu build with custom dep builds and LCG based builds on
cc7 and slc6

remove propagator options from HelicalTrackLinearizer config and move creation inside linearize method

introduce option to use full vertex covariance for IP estimation and remove unique_ptr for TrackToVertexIPEstimator return value

add two methods to add and remove single vertex from fitter state multiMap as opposed to update entire map every single time

use references instead of pointers for KalmanUpdaters, use VertexSmoothing properly without TracksAtVertex