MTLR 0.2.1

Added the option to obtain survival probabilities at specified times (see predict with type = "prob_times").
When using predict with "prob_event" there is no longer a linear extension added if the survival curve never reaches 0. The linear extension is still present in the "mean_time" and "median_time" options however.
Internally some sapply commands were refactored so to not iterate over indexes.
Tests were changed as to not clash with future ggplot2 updates -- tests were checking against internal structures as opposed to visual differences.

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