DIfferent constructors, some support for full covariance (data structure may change)
Different constructors, inner constructor from matrices now.
slightly faster llpg() for :diag GMM
More full covariance
Merge branch 'master' of https://github.com/davidavdav/GMMs

Conflicts:
	src/datatype.jl
	src/gmms.jl
export rand()
nparams(), cov asymetry, full(), diag(), :full in GMM(data), split(:full), post(:full), em!(:full)
error fix
added rand.jl
implemented :full
rand(GMM) and rand(::GMM)