Add Cython support

Cython / Pyrex files can show as .pyx | .pxi | .pxd and share most of the
Python syntax.

Issue #99

src/lib.rs

@@ -64,6 +64,7 @@ pub enum Lang {
     Css,
     CUDA,
     CUDAHeader,
+    Cython,
     D,
     Dart,
     DeviceTree,
@@ -184,6 +185,7 @@ impl Lang {
             Css => "CSS",
             CUDA => "CUDA",
             CUDAHeader => "CUDA Header",
+            Cython => "Cython",
             D => "D",
             Dart => "Dart",
             DeviceTree => "DeviceTree",
@@ -398,6 +400,7 @@ pub fn lang_from_ext(filepath: &str) -> Lang {
         "purs" => PureScript,
         "arr" => Pyret,
         "py" => Python,
+        "pxi" | "pxd" | "pyx" => Cython,
         "r" => R,
         "rake" | "rb" => Ruby,
         "rhtml" | "erb" => RubyHtml,
@@ -468,9 +471,9 @@ pub fn counter_config_for_lang<'a>(lang: Lang) -> (SmallVec<[&'a str; 3]>, Small
         Perl   => (smallvec!["#"], smallvec![("=pod", "=cut")]),
         Puppet => (smallvec!["#"], smallvec![]),
         Pyret  => (smallvec!["#"], smallvec![("#|", "|#")]),
-        Python => (smallvec!["#"], smallvec![("'''", "'''")]),
         Ruby   => (smallvec!["#"], smallvec![("=begin", "=end")]),
         Sql    => (smallvec!["--"], smallvec![("/*", "*/")]),
+        Python | Cython => (smallvec!["#"], smallvec![("'''", "'''")]),
 
         Haskell | Idris | Agda | PureScript | Elm => (smallvec!["--"], smallvec![("{-", "-}")]),