Added Propeller Spin language to languages.yml
Added sample Spin code objects to samples/Propeller Spin/
Converted spin samples from UTF16LE to UTF8 character encoding.
Changed Propeller Spin primary_extension key to extensions and set value as array
add release instructions to README
improve release instructions
one more tweak
Merge pull request #1172 from github/include-release-instructions-in-readme

add release instructions to README
Merge pull request #988 from lamestation/master

Added Propeller Spin language to languages.yml
Samples update
Add FORTRAN samples.
Add Forth extensions .f and .for; add heuristics for Forth and FORTRAN.
Update samples.json.