Start on LaTeX

Pave the way for Jason's LaTeX macro support.
Also, uniformize the capitalization of "ETag".

vendor/plugins/maruku/lib/maruku/ext/math/latex_fix.rb

@@ -0,0 +1,12 @@
+class String
+
+        # fix some LaTeX command-name clashes
+        def fix_latex
+	   if #{html_math_engine} == 'itex2mml'
+                s = self.gsub("\\mathop{", "\\operatorname{")
+		s.gsub("\\space{", "\\itexspace{")
+	   else
+		self
+	   end
+        end
+end

vendor/plugins/maruku/lib/maruku/ext/math/to_latex.rb

@@ -1,16 +1,17 @@
-
 module MaRuKu; module Out; module Latex
 
+require 'maruku/ext/math/latex_fix'
+
 	def to_latex_inline_math
-		"$#{self.math.strip}$"
+		s = "$#{self.math.strip}$".fix_latex
 	end
 
 	def to_latex_equation
 		if self.label
 			l =  "\\label{#{self.label}}"
-			"\\begin{equation}\n#{self.math.strip}\n#{l}\\end{equation}\n"
+			"\\begin{equation}\n#{self.math.strip}\n#{l}\\end{equation}\n".fix_latex
 		else
-			"\\begin{displaymath}\n#{self.math.strip}\n\\end{displaymath}\n"
+			"\\begin{displaymath}\n#{self.math.strip}\n\\end{displaymath}\n".fix_latex
 		end
 	end
 	
@@ -18,4 +19,4 @@ module MaRuKu; module Out; module Latex
 		"\\eqref{#{self.eqid}}"
 	end
 
-end end end
+end end end