Added LSL language to 'lib/linguist/languages.yml'
Added LSL sample to 'samples/LSL/LSL.lsl'
Added tests for LSL to 'test/test_language.rb'
removed LSLalias from 'lib/linguist/languages.yml'
removed find_by_alias('lsl') test
Merge branch 'master' into 1444-local
Samples
For the pendants
Merge pull request #1502 from github/1444-local

1444 local
Taking Heuristics for a spin.
Another sample file
Another sample file

Conflicts:
	lib/linguist/samples.json
Merge branch 'master' into prolog-pl-samples

Conflicts:
	lib/linguist/languages.yml
	lib/linguist/samples.json
Merge pull request #1503 from github/prolog-pl-samples

Prolog pl samples
Add a multitude of Forth file extensions.
Yes, these are all in use.
Add Groff sample.
Update samples.json.
Make test_pedantic accept quotes around extensions.