Update README

Update requirements.txt

Add urlopen_mc.mochi as an example of use spawn_mc. The execution speed is slower than urlopen.mochi because it is the I/O-bound task.

Fix a pid that is passed to taskset command

Add spawn_mc function that executes actors in multiple processes to gain effects of multi-core processor

Merge branch 'd6e-patch-1'

Remove duplicate lines.

Add the ref pattern to the match syntax

Remove trailing-if-expr from the grammar

Add a test for if-expressions

Add assert-statement. Change if-statement to an expression. Add -O option and -OO option

Fix the value of sys.argv

Prepare version 0.2.7

cosmetic change

Change to raise an exception when a pattern matching fails