Added incomplete Pbrain and Brainfork extensions.
Added stub Pbrain commands and improved loop command.
Implemented Pbrain commands.
Added new examples and fixed a problem with newlines.
Slightly improved performance in a critical section.
Removed Brainfork since plans changed.
Removed test dependency from travis project as there is none.
Reworked a lot of stuff for threading.
Forking now works.
Added support for thread joins.
Merge branch 'release/v1.0'