Merge pull request #49 from julianwachholz/fix/filehandle

Make sure to close file handle when saving workbook

Author: kevmo314

pyexcelerate/Workbook.py

@@ -78,4 +78,5 @@ def _save(self, file_handle):
 		self._writer.save(file_handle)
 
 	def save(self, filename):
-		self._save(open(filename, 'wb'))
+		with open(filename, 'wb') as fp:
+			self._save(fp)