Add windows script to perform "make" and "make clean" commands

clean.bat

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+Rem manually performs "make clean"
+del *.aux *.d *.toc *.out *.log *.nav *.snm *.sbx *.sxd

make.bat

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+Rem build tex file from songbook file
+songbook.py --songbook=%1.sb --output=%1.tex
+
+Rem 1st pdf compilation 
+pdflatex %1.tex
+
+Rem build indexes
+songbook-makeindex.py %1_title.sxd > %1_title.sbx
+songbook-makeindex.py %1_auth.sxd > %1_auth.sbx
+
+Rem 2nd compilation to include indexes
+pdflatex %1.tex