Added detection for the new M (aka MUMPS) language.
Improved M detection to be more specific.
Use Common Lisp lexer for M syntax highlighting, which gives pretty good results.
Improved comment.
Fixed M lexer name.  Merged with upstream's latest changes.
Added detection for the Pike language:

http://pike.ida.liu.se/
Update vendor.yml to include jQuery UI
Improve detection for ASP.NET validation jQuery plugins
Added support for the CLIPS programming language

CLIPS or C language integrated production system is a tool for writing expert
systems.
Fixed an issue where the lexer was not explicitly stated for CLIPS
use downcase string for extname
determine image with downcase extname
Added to vendor.yml the following dependencies related to automake and autoconf:
- (^|/)configure
- (^|/)configure.ac
- (^|/)config.guess
- (^|/)config.sub

Before changing:
[herbert@vps11071 linguist]$ bundle exec linguist ../atmi++/
75%  Shell
15%  C++
10%  C
0%   Perl

After changing:
54%  C++
37%  C
9%   Shell
0%   Perl
Datomic dtm files
(BFDD) build-system failure driven development
better: edn is generic
Merge remote-tracking branch 'upstream/master'
Add a misclassified Prolog file

This Prolog file was misclassified as Perl.  I assume linguist
was confused because the file has many comments.  Nevertheless,
there are plenty of Prolog-distinguishing tokens such as `:-`,
`module`, `%%`, capitalized variables names, `foo/2`, etc.
Added Xtend (xtend-lang.org) to languages.yml
remove redundant specification