Add Opal to list of recognized languages
Added PigLatin language identification.
Updated languages.yml to associate *.pig files with PigLatin.
Added pig script example to samples/.
Updated the samples.json with to account for new sample.
Reverted samples.json.
Merge pull request #1477 from DeathByTape/master

Added PigLatin language identification.
Samples
Merge pull request #1475 from StoneCypher/AddOpalToRecognizedLanguages

Add Opal to list of recognized languages
Samples
Add FORTRAN samples.
Add Forth extensions .f and .for; add heuristics for Forth and FORTRAN.
Update samples.json.