PopED for R version 0.1.1

• Updated package author list
• New functionality to compute the ED OFV using the Laplace approximation.
  This can be orders of magnitude faster than the standard MC integration approach.
  See ?ed_laplace_ofv and ?evaluate.e.ofv.fim
• Added a general function to compute the FIM and OFV(FIM) for all avaialbale methods in PopED.
  See ?calc_ofv_and_fim.
• Added a general optimization algorithm RS_opt_gen() that works for both D-family and
  E-family optimization.
• Added optimization of E-family designs to poped_optimize().
• Changed distribution tests for package building
• Fixed bug where correlations between BSV (between subject variability) terms in the model gave an error when creating a PopED database
• Fixed a bug where get_rse failed when a parameter had a value of 3.