add logo and update gcd and make lcm

scripts/pretty.py

@@ -0,0 +1,16 @@
+from yapf.yapflib.yapf_api import FormatCode
+import re
+import pprint
+import os
+files = os.listdir('../snippets')
+codeRe = "```\s*python([\s\S]*?)```"
+for file in files:
+    someFile = open("../snippets/" + file)
+    fileData = someFile.read() 
+    someFile.close()
+    originalCode = re.search(codeRe,fileData).group(0)
+    formatedCode = FormatCode(re.split(codeRe,fileData)[1])
+    fileToSave = fileData.replace(originalCode,('```python \n'+formatedCode[0]+'\n```\n'))
+    someFile = open("../snippets/"+file,'w')
+    someFile.write(fileToSave)
+    someFile.close()