removed all SNPRelate, gdsfmt, rcpp, rcppeigen based functions. Need to modify the vignette to follow a GCTA based workflow.
updated vignette to reflect the new GCTA based workflow. However, the vignette does not compile. There is an esoteric issue with loading the phenotype data
changed version number, and fixed bug in correlation matrix computation
now citing published article
broke out system file lines
added exmaples to documentatio of all functions in correlation_matrices.R