add details about catching all exceptions (#213)

* add details about catching all exceptions

* Small grammar/wording changes

Author: stevestar888

exceptions.rst

@@ -62,8 +62,16 @@ trapping ALL exceptions:
         # Some logging if you want
         raise e
 
-This can be helpful when you have no idea about the exceptions which may
-be thrown by your program.
+This can be helpful when you have no idea about the exceptions that may
+be thrown by your program. If you are just looking to catch all execptions, 
+but don't actually care about what they are, you can even exclude the 
+``Exception as e`` part. 
+
+Note:: catching all exceptions may have unintended consequences because catching 
+all exceptions may also catch the ones you want to occur; for example, in 
+many command-line based programs, pressing control+c will terminate the program, 
+but if you catch all excepts, the ``KeyboardInterrupt`` will be caught as an 
+exception, so pressing control+c will NOT terminate the program.
 
 ``finally`` clause
 ~~~~~~~~~~~~~~~~~~