Resolution of issue 36

See merge request !21

Fixed bug involving the references to graph blocks and commands in the sdk ext folder that caused the build to fail

Simulink Model Documentation

See merge request !19

Create XSDK instructions in markdown to replace PDF

See merge request !17

Comp graph doc

See merge request !18

Merge branch 'TESTING_documentation_updates' of git.ece.iastate.edu:danc/MicroCART into TESTING_documentation_updates

README files

Made a few documentation changes just going further into detail on some thing surrounding how the quad SW works for anyone that doesnt have much FPGA exiprience.