Bump version to 1.6

Fix SystemCall Exit using the last exit code instead of 0

Fixes #170

Bump version to 1.5

Add separate 64 bit instruction table to documentation

Revert change in renaming heap to bss

It was a stretch to call it .bss and I was thinking about removing
it entirely. So I think sticking with what is was previously called
is better.

Bump version to 1.4

Remove accidental include which requires javafx

Travis overwrote release notes!

Bump version to 1.2 and update README

Bump version and fix a few documentation errors