Add hbs alias for Handlebars

Adds a `hbs` alias for `Handlebars`. It's very commonly used and would make adding hbs code blocks easier in github comments.
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Add .a51 to Assembly

.a51 doc is 8051-asm (coding in MIDE-51)
Add a filename rule for _vimrc
Add .a51 sample
Merge pull request #1614 from creasty/viml_underscore_vimrc

Add a filename rule for _vimrc
Merge pull request #1613 from hearsilent/patch-1

Add .a51 to Assembly
Merge pull request #1612 from briandela/patch-1

Add hbs alias for Handlebars
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Merge branch 'master' of github.com:github/linguist
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