Doc updates
Merge branch 'development' into document

Basically so we can start updating documentation with latest
functioning code.
fastlm updates for demo

created multiple versions of fastlm, stripped them
down to basics
initial demo implementation
demo cleanup
completed demo companion vignette
split up vignette into chunks
cleaning up old vignettes
moved links out of headers
minor doc updates
Merge branch 'development' into misc
fixed parse problem for demo
Address small navigation issues (Fixes #30)
small bug fixes
Added demo and split vignettes