Update README.md

Updated Readme to have proper installation instruction. Prior, it didn't switch directory. 
Update README.md

Removed non-working link to tar file, cleaned up syntax
Merge pull request #83 from tibbon/patch-1

Update README.md
merge readme changes from tibbon
Merge remote-tracking branch 'upstream/master' into bc/clean_up_readme

Conflicts:
	README.md