Custom File.extname method which returns the filename if it is an extension
Remove .rb test
Sample files to test the new FileBlob.extension method
Merge conflicts from master fixed
Remove stylistic yet useless parentheses
Rename file for the test on non-existing extension
Merge branch 'master' into 1285-local

Conflicts:
	lib/linguist/language.rb
	lib/linguist/samples.json
blob.mode
Merge pull request #1371 from github/1285-local

1285 local
Add highlighting for Igor Pro procedures

Available in pygments since 5ceb7533e214.

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>