YAML file recognition for Inform 7, an interactive fiction design language.

The team account https://github.com/i7 has several active Inform 7 projects.
Inform has long lines, so we line wrap.
Merge branch 'master' of https://github.com/github/linguist
Added a lexer definition (text only).
I may build an Inform 7 highlighter/lexer someday, but not this week.
Add .vshader, .fshader, .gshader files for GLSL.
Oops, looks like this has to be alphabetical...
New file extensions and samples for SQL
Merge pull request #1101 from pchaigno/sql-extensions

New file extensions and samples for SQL
Updating samples
Merge pull request #1073 from tajjada/master

Add .vshader, .fshader, .gshader files for GLSL.
Merge pull request #897 from erkyrath/master

YAML file recognition for Inform 7
Updating samples