interface tutorials + links fix

fix links

Update new tutorials

embedded programming

Add: travis-ci build testing

Add: travis-ci build testing

Basic automated gitbook build testing using travis-ci

Update: eagle_english.md

Old tutorial was out of date and still in html format
Converted to markdown and update for eagle 8.0.1

Master

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5 tutorials added

added cnc+fabbercise+image scaling

blank space tip. Very important!

More tutorials + minor fixes  

Merge in FabTinyISP tutorial & fix .pde phrase error

.pde file was causing a FileNotParsableError in gitbooks