fix mac sampler path
New docs for the website
Merge branch 'matteo-docs'
Updated doc-related scripts and fixed badlinks

- updated `make deploy` to clean up remote files
- updated travis test to check both local and deepdive.stanford.edu
- fixed a broken link in ubuntu (was not captured because of lack
		of external check)
- improve linkcheck.sh. you can now use it locally to check external
 		links like this:
		`./linkcheck.sh HOST --check-extern`
Configured the makefile to use Robin or env DEPLOY_USER for deploying

- if your local username `whoami` is the one you want to use when
deploying deepdive, just `make deploy`.
- if you want to use specific account, e.g. foobar, run:
	`DEPLOY_USER=foobar make deploy`
Added documentation to doc/Makefile
Fix isPositive bug
Fix isPositive bug
merge master and fix paths for sampler