Print the whole backtrace when there is an error
Modify the name paddig

- Remove the pid
- Use size of the code block with the longest name
Add block modifiers

Can manipulate how a process starts by using a thread for it
instead of a process.
Add testcase for block modifiers
Add sleep and timeout block modifiers

Also symbolize the keys from the header arguments
Update TODO
Merge branch 'code-block-modifiers'
Bump version of the gem